AZW3 Won’t Open on Colorsoft – Need Help

avas · Today, 05:11 AM

Hi everyone,

I’m trying to load AZW3 eBooks (converted from EPUB, not from Amazon) onto my Colorsoft, but I keep getting error messages. Sometimes I can read a few pages, but most of the time they won’t open at all.

I’ve tried:

- Using Calibre via USB
- Send to Kindle (still fails to open)

These same AZW3 books work fine on my 2021 Paperwhite.

Has anyone found a reliable way to get non-Amazon AZW3 eBooks working on Colorsoft? Any advice would be greatly appreciated!

Quoth · Today, 07:45 AM

Reboot the colorsoft, or factory reset.

Surely STK is epub -> KFX for a colorsoft?

Make sure that they are azw3 / KF8 and not old mobi or dual mobi, which will work on most PW, but might not on a Colorsoft.

Has it big images?

avas · Today, 11:31 AM

Quote:

Originally Posted by Quoth

Reboot the colorsoft, or factory reset.

Surely STK is epub -> KFX for a colorsoft?

Make sure that they are azw3 / KF8 and not old mobi or dual mobi, which will work on most PW, but might not on a Colorsoft.

Has it big images?

Sure, the file is in EPUB format when I upload it to STK

I’ve confirmed all the converted files are AZW3 (not old MOBI).
I already tried rebooting and even factory resetting the device, but still no luck.

Interestingly, for manga in AZW3 format, I can read them without issue. But once I import an AZW3 book with only text, the error message appears — and after that, I also can’t open the manga anymore.

Sirtel · Today, 12:09 PM

Does it read Amazon purchases directly downloaded from Amazon? If not, then something is clearly wrong with your Colorsoft.

Today, 05:11 AM	#1
avas Junior Member Posts: 2 Karma: 10 Join Date: Aug 2025 Device: kindle colorsoft	AZW3 Won’t Open on Colorsoft – Need Help Hi everyone, I’m trying to load AZW3 eBooks (converted from EPUB, not from Amazon) onto my Colorsoft, but I keep getting error messages. Sometimes I can read a few pages, but most of the time they won’t open at all. I’ve tried: - Using Calibre via USB - Send to Kindle (still fails to open) These same AZW3 books work fine on my 2021 Paperwhite. Has anyone found a reliable way to get non-Amazon AZW3 eBooks working on Colorsoft? Any advice would be greatly appreciated!

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Today, 07:45 AM	#2
Quoth Still reading Posts: 14,412 Karma: 107076273 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	Reboot the colorsoft, or factory reset. Surely STK is epub -> KFX for a colorsoft? Make sure that they are azw3 / KF8 and not old mobi or dual mobi, which will work on most PW, but might not on a Colorsoft. Has it big images?

Today, 12:09 PM	#4
Sirtel Grand Sorcerer Posts: 13,675 Karma: 242197301 Join Date: Jan 2014 Location: Estonia Device: Kobo Sage & Libra 2	Does it read Amazon purchases directly downloaded from Amazon? If not, then something is clearly wrong with your Colorsoft.

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