My device version is bigip- 22.214.171.124, the upgraded version is 126.96.36.199, ASM and AVR modules are used, and now after switching from version 14 to version 15, the status of the device changes to "UNKNOWN", and the configuration cannot be loaded , the module cannot be displayed and loaded normally, and it will return to normal after returning to version 14. Doing a "load sys config verify" reload also doesn't load properly.
As said above check the validity dates on your license. Re-activivate it. Then try the load from the command line.
If it fails, what's the error? What does it say in the logs?
There are seldom mysteries about a system not coming up. Clues should be liberally sprinkled through the logs and the console.
I try to list step before upgrade version, could you try step below before upgrade ?
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