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dear this machine restore or revive but error coming lock sign

NO DIS PLAY

We have done the Hardware test as per apple guide line. There is no any hardware issue found.

We have used Above mention BIOS . Display is coming. After that We installed the Mac OS Catalina. Installation completed and then showing below attached error and machine not booting

We have attached the BIOS in that display is showing but BIOS is firmware Lock. Is it possible to unlock the BIOS?

please repair this bios

We have tried above mention BIOS .in that BIOS display is not coming

Can you give the different BIOS?

Hi can u repair attached BIOS?

Ďuring OS updation system was shutdown after few minutes when i tried to powering on then system is on but no display . We have diagnose the BiOS file was corrupted . We have tried another BIOS then display come but that BIOS is FirmWare Locke

NO DISPLAY

NO DISPLAY