Hi, the procedure is simple.
0) Get Serial and CID of old book you want to use. Lets assume the CID of the original card is 1234c56e as an example
1) Preparation
Open the device and remove the internal SD. To open it use a blow drier on the frontside and very carefully lift the frontframe around the screen. After that remove the 4 screws and you can lift the mainboard including the screen. Now remove the internal SD, clone it, either with Linux or windows (
https://www.alexpage.de/usb-image-tool/). On the cloned card (new SD) run the linux filechecks on every partition to make sure the filessystem is repaired.
2) create file sd_orig_serial with the original CID as content: 0x1234c56e & put under root (Partition that holds /etc/init.d/rcs)
3) Point the device to accept this as the CID by changing /etc/init.d/rcS
from:
/bin/mount -o remount,ro rootfs /
/bin/mount -t proc none /proc
/bin/mount -t tmpfs none /var -o size=48M
/bin/mount -t sysfs none /sys
chmod 1755 /var
to
/bin/mount -o remount,ro rootfs /
/bin/mount -t proc none /proc
/bin/mount -t tmpfs none /var -o size=48M
/bin/mount -t sysfs none /sys
#trick system into another CID
/bin/mount -o bind sd_orig_serial /sys/block/mmcblk0/device/serial
chmod 1755 /var
Put the new card into the device and it should work. Don't try the other tricks it will destroy you TTS since this is stored elsewhere and we don't have a crack for it.