Quote:
Originally Posted by dedeca
I did a forum search on SSH on Kindle and found that I know absolutely nothing about it.  If I tried, I would probably lock my device. Anyway, I'll keep researching, who knows, one day... 
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So... i was able to downgrade using SSH from KOreader + ubuntu in VirtualBox

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I did the procedure on my PW3, it was on firmware 5.14.3 and I managed to downgrade it to 5.13.5. The interesting thing is that after the reboot it was completely buggy, as if the two interfaces had mixed up. Since I couldn't access the settings, I passed an empty file DO_FACTORY_RESTORE and restarted it. Now everything is working perfectly.