Long story short, srx 5400 crashed and went into boot loop. I took working snapshot to usb from another 5400 and booted faulty srx with usb, seems ok. But question is, how can i get content from usb back to compact flash ? With 5400 only snapshot media option is usb.
If you have managed to boot your SRX5400 via the snapshot, I would just do a reinstall of the Junos image to properly write the software to the compact flash.
Just download the install package, do request system add <image> and then reboot in a planned maintenance window.
Tryed that but it returned error:
/usr/libexec/ui/downgrade: the bootstrap installer is missing...
Is it possible to verify that the CF card is actualy working ok ?