FAP-U421EV reset factory issue

Hello guys,

I have a bad time trying to figure out a Fortinet FAP-U421EV issue.

I have 03 old FAP-U421EV that I want to reset to default factory configuration, but the problem is that I don't have the old credentials (it was configured by another person).

I tried to reset them using the pin at the back of the AP but it won't work. Actually, I logged in using the Console Port and noticed that it is stuck on a boot loop. The following message is being displayed " Hit any key to stop autoboot " and actually I did press any key but it's asking for a password and I tried all the default ones (admin, blank, password) but nothing seems to work :

 

......

Net: Registering eth

Broadcom BCM IPROC Ethernet driver 0.1

Using GMAC1 (0x18023000)

et0: ethHw_chipAttach phyaddr (0x1e)

et0: ethHw_chipAttach: Chip ID: 0xcf1e; phyaddr: 0x1e

bcm_robo_attach: devid: 0xd

bcmiproc_eth-0

 

*********************************************************

Please add diag support DIAGS_BOARD to:

BCM953022K

BCM953025K

BCM953025K_REV2

BCM958622HR

BCM958623HR

BCM958522ER

BCM958625HR

in env before you can run any diags

*********************************************************

COM2 is not configured due to board type

COM3 is not configured due to board type

Hit any key to stop autoboot: 2

Please enter password:

 

Can you guys point me to some fixing that I can do?