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Need Help Hp L25500 firmware downgrade


Defne Reklam
Hello everyone
I have many problem with my printer l25500 after last firmware upgrade.
I want to downgrade
is it possible? I am trying load Old firmware but Process show the Fail.
I am sure downgrade possible but How
Maybe I need Hp Secret or special Hp Service Software.

I get 50.1:11 Error When Printer Starting,
After a few minutes Printer give 79:04 error.

50.1:11 Not listed in Servece manual. but 50.01:11 About omas Sensor
How can I disable omas system?