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Old 02-24-2019, 06:49 PM   #16
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Quote:
Originally Posted by stmusic View Post
I find and this on ali 1.8V USB to TTL line USB transfer serial line 1.8V brush line download line
is this same like that from ebay ?
If you don't mind waiting a month for it to arrive.
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Old 02-27-2019, 07:15 AM   #17
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I used this one, remove the jumper and attach the voltage wire in addition to TX RX and GND and it works just fine.

https://www.ebay.com/itm/FT232RL-3-3...72.m2749.l2649
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Old 02-27-2019, 09:25 AM   #18
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eruditionastic is this 1.8v ?
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Old 02-27-2019, 10:22 AM   #19
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Quote:
Originally Posted by stmusic View Post
eruditionastic is this 1.8v ?
Yes it can be. If the jumper is on, power is provided from the USB side and will be 3.3v or 5v. If you remove the jumper completely, power will come from the Kindle board itself, which is why you'll need to solder/tap a fourth wire for power to the board. The kindle provides 1.8v.

Where to solder or pin:
https://www.mobileread.com/forums/at...1&d=1447624524

Where to connect wires to the board:
https://www.mobileread.com/forums/at...3&d=1516804315
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Old 02-28-2019, 12:55 PM   #20
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eruditionastic where is to put fourth wire for power to the board, this is picture of board of pw4 from this topic, same board i have on pw 4.
https://www.mobileread.com/forums/at...8&d=1544783589
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Old 02-28-2019, 01:42 PM   #21
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Quote:
Originally Posted by stmusic View Post
eruditionastic where is to put fourth wire for power to the board, this is picture of board of pw4 from this topic, same board i have on pw 4.
https://www.mobileread.com/forums/at...8&d=1544783589
I don't know where the power is on a PW4. You could use a multimeter and find it though. Use a screw as the ground and poke around until you see something with 1.8v on it.

I only saw one person try so far and they didn't find a 1.8v source on a PW4. Hopefully you can and let us know!

https://www.mobileread.com/forums/sh...ial+pw4&page=3

Last edited by eruditionastic; 02-28-2019 at 01:49 PM.
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Old 03-08-2019, 09:15 PM   #22
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Is this cable good PL2303TA USB TTL to RS232 ?
and i find this PL2303HX, is it good PL2303HX ?

eruditionastic if i have external power of 1.8v is this FT232RL work like that ?

Last edited by stmusic; 03-09-2019 at 08:28 AM.
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Old 03-09-2019, 08:59 PM   #23
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I find 1.8v on pw 4
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Last edited by stmusic; 03-09-2019 at 09:07 PM.
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Old 03-10-2019, 07:52 PM   #24
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Very cool you found it! Not sure what you are asking with the cable. I don't think that one you linked will work well. It's 5v only it looks like.
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Old 03-21-2019, 03:36 PM   #25
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I am stuck in demo mode.
I entered command ";demo" and now not possible to exit.
Kindle now connected with serial cable with putty
What to do in putty ?
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Last edited by stmusic; 03-21-2019 at 03:41 PM.
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Old 03-21-2019, 06:23 PM   #26
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@stmusic: There are over 110 Kindle variants, you'll have to be a little more precise.
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Old 03-21-2019, 07:04 PM   #27
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PW4 wifi, good pw, i type ";demo" and not use wifi and pw 4 now stuck in demo mode.

I use serial cable and what need to do now ?

On enter in putty i have this:
Menu
====
3. Load MMC over USB storage
E. Export FAT partition
U. Update using update*.bin file on FAT partition
D. dmesg / kernel printk ring buffer.
Q. quit

On 3 not working, how to see storage on kindle ?

Update:
I try E. Export FAT partition and now i see partition of kindle,
what to do next, what to upload on pw4 memories, which fw ?

I resolve this with DO_FACTORY_RESTORE in demo folder.

But still is my question only for curiosity :
When i do E. Export FAT partition what to upload on pw4 memories, which fw is good solution ?

Last edited by stmusic; 03-21-2019 at 09:31 PM.
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Old 03-21-2019, 11:01 PM   #28
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Your choice of update packages posted by Amazon for your device.
(They only list the most recent, but you can get older by just changing the URL version field.)


Export to USB


Put package at top of visible USB storage


Remove USB cord


Reboot
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Old 06-16-2019, 09:54 PM   #29
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Quote:
Originally Posted by matko View Post
There is one last thing I'd like to try:
Code:
fastboot flash system rootfs.img
(using rootfs.img extracted from 5.10.0.1 factory package)

but this is a one-way step. If it fails, my Kindle will probably be bricked ...
I was brave/stupid enough to try this today. My kindle is already bricked and amazon have given up on fixing the bug that killed it and refunded me so I'm happy to do risky things if it helps the community.

Code:
mint@mint:~/Downloads/Fastboot-Kindle$ sudo ./fastboot flash system rootfs.img
downloading 'system'...
OKAY [ 27.323s]
writing 'system'...
FAILED (remote: locked command)
finished. total time: 27.331s
& the serial output:
Code:
Starting download of 460800000 bytes
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downloading of 460800000 bytes finished
locked command: flash:system
Seems to me that 'flash' is in fact locked. So unless we can unlock some of these commands somehow, I'm running out of options.
(Maybe fastboot oem unlock / fastboot flashing unlock would work?)


So I'm back to a state where I can mount my FAT32 partition and feed it an update but little else.
I foolishly updated it to 5.11.2 this way (should have tried the latest factory image in hindsight) - so I think I'm out of options unless/until a later factory image comes along.

A bit of a bummer that they're making these things harder to repair. I don't really want to toss this thing in to landfill over a software bug.

Code:
<12>[    6.686323] ERROR:OTA version is less then current device version
<12>[    6.686345] ERROR:do_unbundle: validate_version failed.
<12>[    6.694565] INFO:No uboot image found! skipping uboot installation.
<12>[    6.694594] INFO:No sbios image found! skipping sbios installation.
<12>[    6.694612] INFO:No fbios image found! skipping fbios installation.
<12>[    6.694644] ERROR:Could not unbundle /mnt-us/update_pw4_5.10.1.3_factory.bin,error_code=12
<12>[   32.108506] /mnt-us/update_pw4_5.10.1.3_factory.bin MD5SUM: 21275d9845c2edd358780df555db3328

Last edited by SenorClean; 06-16-2019 at 10:07 PM.
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Old 06-17-2019, 12:46 AM   #30
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You can skip all of that theorizing.
The Kindle fastboot can not load the rootfs.img file, file is too big and the Kindle fastboot can not detect the failure.
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