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thx arci - i thought there would be a way to analyze the kernel.img...
OK - then I mark the kernel version of the fullbackup using the kernel description (ULK for new, anything else for old kernels)...
only thing left: testing my fullbackup with azup

my new procedere:
  • box in rescue mode? if no reboot to rm
  • box overclocked? if yes switch it to normal mode and reboot
  • enough ram available?
  • started tool from /tmp? otherwise big warning for flashing
  • check kernel CRC on PC
  • check for same kernel CRC after uploading
  • check for same kernel CRC after flashing (if it fails - install old kernel again)
  • setting up environment for either old or new kernel
  • flash image
  • done
OK ... but three things yet:

1) box in rescue mode? if no reboot to rm

Yesterday, I have made an Italian guide for flashing AZBoxHD with the MAT and in a test phase ... at reboot the receiver did not go into rescue mode ... but it start previous stored DOM image ... and the tool is remained on waiting stalled !

Since we were still in the safety area (no flashing procedure started) I turned off the receiver and closed the tool ... then I started with the receiver already in rescue mode (STB On - Vol +) ... and of course everything went correctly !
Only, so you know ...

2) started tool from /tmp? otherwise big warning for flashing

OK ... I have not checked if already is possible ... but wanting ... it would not be appropriate to allow the cache and transfer procedure using also an USB storage device ? ... if the user prefers this ... obviously with choice conditioned by the tool !

3) check for same kernel CRC after flashing (if it fails - install old kernel again)

After you have flashed the new kernel on nor-flash and the CRC control not passes, how do you restore previous kernel version? Do you do a security backup before flashing process? I think so ...

Have a nice day and thanks for the great support ... Ciao