PocketBook 515 - Read-only memory problem

[bpjl]

Hi,

I tried to solve the read-only memory problem in my PocketBook 515 according to this thread https://www.mobileread.com/forums/sh...6&postcount=37 and this tutorial http://www.luator.de/linux /2019/11/23/pocketbook-replace-memory.html And here is my workflow:

01. I have made an image of an old SD card

dd if=/dev/sdx of=pocketbook_original_image.dd bs=512 conv=noerror,sync

and uploaded it to a new one

dd if=pocketbook_original_image.dd of=/dev/sdx bs=512 conv=sync,notrunc

02. I pulled the CID from the old card as follows:

Assuming you have the proper hardware, there are several methods you can use to get the card information. With Linux, reading the internal SD card information is simple. Insert the card and look under /sys/block/mmcblk0/device/ (this location may change depending on your platform, it may be mmcblk1 or in a different location). Under this location you will see several attributes available that include the CID and CSD registers and the information inside it.

To view the CID, the command is cat /sys/block/mmcblk0/device/cid (the exact location may be different)

This is how I got the CID file with the following number:

834e434e43617264025730359300f100

03. From the cramfs.bin file (found on the 8 partition of the old memory card) I extracted the monitor.app file

04. In the HEX editor I made the following change:


05. I named a copy of the CID file .sd_original_serial and copied it to the 9 partition of the new SD card. I saved the changed monitor.app file on the 8 partition as monitor_patched.app

06. Then, being on this 8 partition, I ran the following commands:
[code]chmod a+x monitor_patched.app
mv pocketbook pocketbook_ORIG
ln -s monitor_patched.app pocketbook[/ code]

Unfortunately, all this work did not give a positive result. When I turn on the reader, there is only an hourglass on the screen. I don't know where the error might be.

[nhedgehog]

Hi It is not the whole CID but only a part of it that you need.
You used this:
cat /sys/block/mmcblk0/device/cid
but need this:
cat /sys/block/mmcblk0/device/serial
Mine looks like this f.i.:
caf0e169
But this works only up to a certain firmware specified in the PB626 internal SD Card fail thread.

[bpjl]

Originally Posted by nhedgehog

Hi It is not the whole CID but only a part of it that you need.
You used this:
cat /sys/block/mmcblk0/device/cid
but need this:
cat /sys/block/mmcblk0/device/serial

Hi, When the attempts with CID failed, I tried with the number from the SERIAL file. Also unsuccessful.

Originally Posted by nhedgehog

But this works only up to a certain firmware specified in the PB626 internal SD Card fail thread.

But it doesn't hurt to try

Fortunately, I found this guide - https://4pda.to/forum/index.php?show...entry105586602

Following it step by step, we were able to run PocetBook 515W without any problems.