APPLE 820-00045-A NO BOOT OS

Hello...
I have problem MAC apple 820-00045-A cannot booting to OS, out of simbol harddrive
can help me??

KETUT wrote: Hello...
I have problem MAC apple 820-00045-A cannot booting to OS, out of simbol harddrive
can help me??

this is first problem

That shows iether no OS found or unsupported OS ver if memory serves me correct, ? would normally be no OS found.
What happens if you press & hold the options key during boot, then disk tools, format drive & instal OS from local external source ?

Cyber16 wrote: That shows iether no OS found or unsupported OS ver if memory serves me correct, ? would normally be no OS found.
What happens if you press & hold the options key during boot, then disk tools, format drive & instal OS from local external source ?

first time can installed from internal....after that cannot....need instal from wifi...am instal from wifi....after that restart the mac....inthe screen look (folder?)
i cek the ssd/harddrive not detected if i press OPTION

iCloud may have locked the drive again, what happens when you press & hold options?
Does the lock come up?
may been to ref last the efi & clear/zap pram.
It is not a good idea to install via cloud. Make a MacOS instal usb drive

At least set your own efi password temporarily prior to OS install

I am just taking shots at this point of what the problems could be
Did you install the original efi dump with the ORIGINAL ME region ?
if from a donor efi, that ME needs to be cleaned first

edit:
Was the ssd drive installed when efi unlock was done?

Cyber16 wrote: iCloud may have locked the drive again, what happens when you press & hold options?
Does the lock come up?
may been to ref last the efi & clear/zap pram.
It is not a good idea to install via cloud. Make a MacOS instal usb drive

At least set your own efi password temporarily prior to OS install

I am just taking shots at this point of what the problems could be
Did you install the original efi dump with the ORIGINAL ME region ?
if from a donor efi, that ME needs to be cleaned first

edit:
Was the ssd drive installed when efi unlock was done?

after press option only conectvto wifi

Ssd onboard

Only that the choice, what the solution

Last update

try to format the SSD drive with alternative book and instal OS from USB pendrive