MobileRead Forums - View Single Post - non-kindle unlimited books not opening

kags · 10-20-2025, 04:01 PM

To be even more clear, I used Calibre's send specific format to device feature (selecting the AWZ3 format) with a USB connected Kindle. As best I can tell, this should have nothing to do with networking/cloud. The outage was a coincidence but a non-factor in this observation (I did have to wait the outage out to get some other Kindle Unlimited books to download on my device though).

Re the Content Not Synced message that sherri0629 is encountering --- this is something commonly encountered when dealing with sideloaded books and trying to add them to a collection (going from one collection to another is included in that bucket). I've been seeing that message for a while now ---essentially since I started using my Kindle Paperwhite (2024). I was getting that message when AZW3 books were still opening correctly, so that definitely predates the new observed behavior of AZW3 books erroring out.

Therefore, I will now be converting everything to KFX. Probably for the best-ish.... as you do enable all the Kindle's features when on this format (such as the upgraded page scroll).

10-20-2025, 04:01 PM	#13
kags Junior Member Posts: 3 Karma: 10 Join Date: Oct 2025 Device: Kindle Paperwhite (Signature)	To be even more clear, I used Calibre's send specific format to device feature (selecting the AWZ3 format) with a USB connected Kindle. As best I can tell, this should have nothing to do with networking/cloud. The outage was a coincidence but a non-factor in this observation (I did have to wait the outage out to get some other Kindle Unlimited books to download on my device though). Re the Content Not Synced message that sherri0629 is encountering --- this is something commonly encountered when dealing with sideloaded books and trying to add them to a collection (going from one collection to another is included in that bucket). I've been seeing that message for a while now ---essentially since I started using my Kindle Paperwhite (2024). I was getting that message when AZW3 books were still opening correctly, so that definitely predates the new observed behavior of AZW3 books erroring out. Therefore, I will now be converting everything to KFX. Probably for the best-ish.... as you do enable all the Kindle's features when on this format (such as the upgraded page scroll). Last edited by kags; 10-20-2025 at 04:06 PM.