Problems with newer versions of Kindle firmware
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Wow… never thought I would see a Kindle thread here
Yep something is not right. An e-ink display should be static. Could you check your environment especially nearby lightings and see if there were any recent change that may cause your problem?
ryans Oh, this happened to you too! I'm sorry to hear that, and at the same time it is interesting to confirm that someone besides me has had the same problem.
I am currently using my sea salt solution (see other thread) while waiting until I can get the Kindle into the hands of someone who can downgrade it for me.
Best of luck and keep me posted!
AGI How interesting! Simply changing the font was enough to restore your ability to use the Kindle! Do you have a Kindle basic, I assume? What was the old font, and how did you change it back? I am very eager to try this. (Others had suggested this to me in the past, but I wrote it off as a highly unlikely solution) Glad to hear about your success!
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daniels The original font is Caecilia, and it's still on your device. Simply select the font you wish to use from the settings in your book.
Incidentally, a comment about fonts in general on any device, size them appropriately for the viewing distance. I don't have (and do need) reading glasses, so for handheld devices I need to make the font size quite small not large. This creates the effect of it being further away and thus easier for me to focus on at a close distance. If the letters are bigger, even tho they look nice, at a close distance my eyes cannot focus properly on larger letters anymore like they used to when I was younger. On a monitor it is the opposite, I need larger letters and I am further away from the screen. There are other technical things as well, but I wanted to mention the thing about size, because most people think they need bigger letters, but that's not actually the case every time.
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daniels Following @Sunspark 's suggestion I restored the font to Caecilia, and the discomfort disappeared. I cannot remember what the font had changed into. It could be that, had I pushed through, I would have got used to it, but why change something that works?
Yes, my Kindle is not that old (2019 if I recall correctly), but still the basic model without LED lighting.
Good luck!
Highly recommend the keyboard kindles. they're pretty fragile, but only around $30 on ebay. any touch screen has an IR-LED
I tested on LedEyeStrain group in Telegram the Kindle screen.
No pwm, but High modulation.
So use Kindle with an external light
I don't use Kindles but I have often had firmware updates ruin previously working devices.
Check on xda-dev's, sometime there are ways to hack the device and restore older firmware (I was able to rescue a Fire Stick this way)