Hi, I tried to login one ASR 920-12SZ-IM router but no output came on Putty. Then i try to put router in ROMMON mode to check the IOS it stuck on "Last reset cause: BootFromUpgradeRegFail " doesn't get Rommon> prompt. What else i can do? please sugge...

i have one ASR920 o router which is get stuckes into ROMMON mode. if i tried to boot this device from external drive below error came. plz suggest.RSA Signed RELEASE Image Signature Verification Successful.Image validatedPassing control to the main i...