In my images, update.zip - 15.4.0 (was 15.0.0) was obviously inserted into the “media_data” partition. If “media_data” contains an update.zip lower than 15.3.0, and the device has firmware 15.3.0 or higher installed, when resetting to recovery we will get this error:
https://www.mobileread.com/forums/at...1&d=1728797954
In this case, you can simply flash the corresponding recovery.img (without modifying “media_data”, this will always have to be done after updating the firmware):
https://mega.nz/file/Wp132CrR#HSGKZq...EzHsleLJ1G95SA
https://mega.nz/file/z7oDxLba#lW6eAE...h-8UrD7nSKb5rM