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Proceed with formatting everything and reinstall the FTD application using below guide:
https://www.cisco.com/c/en/us/support/docs/security/firepower-1000-series/220642-reimage-a-secure-firewall-threat-defense.html
Try cold reboot the device and see if you are able to break into rommon post that.
for cold reboot perform below steps:
1) power off the device physically.
2) remove the power cables and wait for 5 mins.
3) replug the power cables and switch on the d...
Kindly check below document for the password-reset for FPR3110 from Rommon:
https://www.cisco.com/c/en/us/td/docs/security/firepower/2100/troubleshoot_fxos/b_2100_CLI_Troubleshoot/b_2100_CLI_Troubleshoot_chapter_011.html#task_vxn_r5h_qdb
Make sure yo...
