I got the SD card image and I wrote it out in my MacBook Pro using Terminal. I am not a programer, only use Terminal if no other alternative. Here is my trial and error log from Terminal. At first I get an 8GB SD to test the image what I got. After I saw it is working well, I took out the corrupt SD card from my Kobo N647 and write out the same image into it. When you see cursor is flashing after Password: it means writing!! Do not disturbe it for a while (about 15-20 minutes)
Please enclose spoiler tags for such a lenthy post - MODERATOR
Spoiler:
SV-MacBook-Pro:~ svaradi$ cd downloads
SV-MacBook-Pro:downloads svaradi$ ls -l
total 7243120
-rwxr-xr-x@ 1 svaradi staff 1977614336 Jul 21 11:09 kobo_2gb_microsd_v1-9.img
SV-MacBook-Pro:downloads svaradi$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.1 GB disk3
1: DOS_FAT_32 8 GB_MINI 8.1 GB disk3s1
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
/dev/disk6
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *2.0 GB disk6
1: Linux 270.1 MB disk6s1
2: Linux 538.3 MB disk6s2
3: DOS_FAT_32 KOBOeReader 1.2 GB disk6s3
SV-MacBook-Pro:downloads svaradi$ diskutil unmountDisk /dev/disk3
Unmount of all volumes on disk3 was successful
SV-MacBook-Pro:downloads svaradi$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
Sorry, try again.
Password:
Sorry, try again.
Password:
sudo: 2 incorrect password attempts
SV-MacBook-Pro:downloads svaradi$ su dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
Password:
su: Sorry
SV-MacBook-Pro:downloads svaradi$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
Sorry, try again.
Password:
Sorry, try again.
Password:
sudo: 2 incorrect password attempts
SV-MacBook-Pro:downloads svaradi$ resetpassword
-bash: resetpassword: command not found
SV-MacBook-Pro:downloads svaradi$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
Sorry, try again.
Password:
svaradi is not in the sudoers file. This incident will be reported.
SV-MacBook-Pro:downloads svaradi$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
Sorry, try again.
Password:
Sorry, try again.
Password:
sudo: 2 incorrect password attempts
SV-MacBook-Pro:downloads svaradi$ man sudo
SV-MacBook-Pro:downloads svaradi$ sudoers
-bash: sudoers: command not found
SV-MacBook-Pro:downloads svaradi$ su - admin >>here your admin name i.e. root
Password:
SV-MacBook-Pro:~ admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.1 GB disk3
1: DOS_FAT_32 8 GB_MINI 8.1 GB disk3s1
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
/dev/disk6
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *2.0 GB disk6
1: Linux 270.1 MB disk6s1
2: Linux 538.3 MB disk6s2
3: DOS_FAT_32 KOBOeReader 1.2 GB disk6s3
SV-MacBook-Pro:~ admin$ diskutil unmountDisk /dev/disk3
Unmount of disk3 failed: at least one volume could not be unmounted
SV-MacBook-Pro:~ admin$ diskutil unmountDisk /dev/disk3s1
Unmount of disk3 failed: at least one volume could not be unmounted
SV-MacBook-Pro:~ admin$ cd users/svaradi/downloads
-bash: cd: users/svaradi/downloads: No such file or directory
SV-MacBook-Pro:~ admin$ cd /users/svaradi/downloads
SV-MacBook-Pro:downloads admin$ list -l
-bash: list: command not found
SV-MacBook-Pro:downloads admin$ dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
dd: /dev/disk3: Permission denied
SV-MacBook-Pro:downloads admin$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
1886+0 records in
1886+0 records out
1977614336 bytes transferred in 1354.336929 secs (1460209 bytes/sec)
SV-MacBook-Pro:downloads admin$ diskutil eject /dev/disk3
Unable to find disk for /dev/disk3
SV-MacBook-Pro:downloads admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
SV-MacBook-Pro:downloads admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *2.0 GB disk3
1: Linux 270.1 MB disk3s1
2: Linux 538.3 MB disk3s2
3: DOS_FAT_32 KOBOeReader 1.2 GB disk3s3
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
SV-MacBook-Pro:downloads admin$ diskutil unmount /dev/disk3
disk3 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead
SV-MacBook-Pro:downloads admin$ diskutil unmountDisk /dev/disk3
Unmount of disk3 failed: at least one volume could not be unmounted
SV-MacBook-Pro:downloads admin$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
Password:
dd: /dev/disk3: Resource busy
SV-MacBook-Pro:downloads admin$ diskutil unmountDisk /dev/disk3
Unmount failed for /dev/disk3
SV-MacBook-Pro:downloads admin$ diskutil unmount /dev/disk3
Unmount failed for /dev/disk3
SV-MacBook-Pro:downloads admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
SV-MacBook-Pro:downloads admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *2.0 GB disk3
1: Linux 270.1 MB disk3s1
2: Linux 538.3 MB disk3s2
3: DOS_FAT_32 KOBOeReader 1.2 GB disk3s3
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
SV-MacBook-Pro:downloads admin$ diskutil unmount /dev/disk3
disk3 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead
SV-MacBook-Pro:downloads admin$ diskutil unmountDisk /dev/disk3
Unmount of disk3 failed: at least one volume could not be unmounted
SV-MacBook-Pro:downloads admin$ diskutil unmount /dev/disk3
disk3 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead
SV-MacBook-Pro:downloads admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *2.0 GB disk3
1: DOS_FAT_32 UNTITLED 2.0 GB disk3s1
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
SV-MacBook-Pro:downloads admin$ diskutil unmountDisk /dev/disk3
Unmount of disk3 failed: at least one volume could not be unmounted
SV-MacBook-Pro:downloads admin$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
Password:
dd: /dev/disk3: Resource busy
SV-MacBook-Pro:downloads admin$ sudo dd bs=1m if=kobo_2gb_microsd_v1-9.img of=/dev/disk3
Password:
1886+0 records in
1886+0 records out
1977614336 bytes transferred in 1446.770536 secs (1366916 bytes/sec)
SV-MacBook-Pro:downloads admin$ diskutil eject /dev/disk3
Unable to find disk for /dev/disk3
SV-MacBook-Pro:downloads admin$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 999.2 GB disk0s2
3: Apple_Boot Recovery HD 784.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS MacBookPro_1T *998.8 GB disk1
Logical Volume on disk0s2
2324D291-B079-4B7A-85F8-FFD742B061E1
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *16.8 MB disk2
1: Apple_partition_map 32.3 KB disk2s1
2: Apple_HFS Flash Player 16.8 MB disk2s2
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *157.3 MB disk4
1: Apple_HFS DivX for Mac 157.2 MB disk4s1
SV-MacBook-Pro:downloads admin$
Use it carefully, I do not want anybody make a "brick, or paperweight" from Kobo Ereader.