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update picore release without mastering image

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meninblek:
Hi, i want to upgrade my system from 14.x to 15.x release. In the directory of 15.x of picore no .img files appears, but only several files relating kernel and its modules..how should i install it on my raspberry?it,s possible to prevent future crashes with a safe rollback procedure?
Thank you,
bye

Juanito:
The "official" install procedure is to download the zip file, unzip it and use dd to burn the img file to an sd card - this will overwrite everything on the sd card.

It is possible to mount the img file and copy the required files to your existing sd card, but this requires knowing what you are doing and leaves scope for mistakes that might render your existing sd card unbootable, overwrite files you want to keep, etc.

meninblek:
Thank you for answer, i’d like to learn more about second choice. My goal is to create a script to sync first partition of my remote device wireless.. where can I found docs about structure of first partition?

Paul_123:
Everything on the first partition needs replaced when changing from 14.x to 15.x, you need to be careful of manual changes made to config.txt and cmdline.txt   Its' just a fat formatted partition.

The second (TCE) partition is where the trick is.  As you need to get new kernel modules from the repo matching the new kernel, as well as updating extensions.  New extensions may have a different dependency tree.

Your best be is to start with a fresh image, and then transfer any settings you had from the 14.x image.

meninblek:
So, if i understand, the best solution could be:
- fresh installation on tester device
- customization of tester device
- when checked, copy first and second partition on remote device and reboot..
correct?

what about mbr? i need to change first 512 byte or no?

Thank's

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