A1418 Bios firmware reset request

[lwc198]

Hi all

I have a firmware blocked iMac, I have replacing with all FF after $svs but it keeps coming up with the password again

S/N C02K3W2JDNCR
EMC 2544

Any help would be appreciated, I have attached the original

Thank you

[peste]

Hi all

I have a firmware blocked iMac, I have replacing with all FF after $svs but it keeps coming up with the password again

S/N C02K3W2JDNCR
EMC 2544

Any help would be appreciated, I have attached the original

Thank you

after writing the bios, reset the PRAM three times

[lwc198]

Thanks for that. I have written the new BIOS and tried to do a PRAM reset straight after first boot but won't let me do the reset.

When I hold options key it shows the padlock and I tested the keyboard on another mac

[bibi019]

i have the same problem unlocked my bios file with filling FF after $svs but it keeps coming up with the lockpad i try to reset pram with combination com+option + P + R but no success if any combination to use or any bit to modify from bios file .emergency

[bibi019]

this is the dump file readed and the file made any suggestion the lockpad still

[minhdigital]

this is the dump file readed and the file made any suggestion the lockpad still

Send to you, after writing the bios, reset the PRAM three times

[bibi019]

i try peram reset with this combination command + option +P+R but not work always the imac startup any other combination

[minhdigital]

i try peram reset with this combination command + option +P+R but not work always the imac startup any other combination

Try with other windows keyboard

[bibi019]

tHanks MeMbers for reply but i tHink tHe reset praM coMbinition not working because tHe iMac A1418 is Mdm.
so any Hope to reMove efi lock and Mdm control.
yours