Quote:
Originally Posted by rkomar
I'm trying to remember if PocketBook stopped allowing older firmware versions to be installed. I'm pretty sure Sony stopped allowing that. I have both kinds of devices, and may be mixing it up in my mind. It would be good if someone who successfully installed a version 4 firmware over a version 5 firmware reported here to let us know.
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PB allows installing firmware in arbitrary order but I'm afraid there is no downloadable 4x firmware for PB 840 (there is only flashed during production). Once you update it to 5x there is no way back.