Supermicro X9DRL-iF doesn't boot anymore. Stuck on code B2

After fiddling with the BIOS settings, my Supermicro X9DRL-iF doesn’t boot anymore. It doesn’t post and get stuck after PXE with the code B2 and the Supermicro logo.

I’ve tried to clear the CMOS by removing the battery and shorting the JBT1 pads, without success.

I’ve tried booting a FreeDOS 1.0 USB stick made with my Mac and Unetbootin, I extracted the BIOS image on the stick and renamed it SUPER.ROM. I tried to boot starting up with CTRL-Home keys pressed, no luck either.

It just reads “sending OOB to BMC” at the bottom of the screen, but it still get stucked at the last Supermicro logo page with code B2…

In the readme file included in the BIOS update zip from Supermicro they are talking about moving the jumpers JPME1 and JPME2 to bypass SPI flash security and force the system to operate in the Manufacture Mode, but II think this is only related to update bios via network.

The ressources I could find:
The MB official manual, the readme from the BIOS zip, this tutorial:
Supermicro X9DRL-iF hang up at POST screen in B2 status code with no any external device