Good to hear that you got it working.
For increading the first partition (the one with the manuals etc. on it) I followed exactly the good tutorial m4mmon provided:
https://www.mobileread.com/forums/sh...4&postcount=39
Everything worked fine and the pocketbook does show the increased memory.
You probably forgot to write the changes made with fdisk, command: w
If something messes up the restoring procedure of the image, the sd card will probably refuse to boot up.