My MacBook A1181 EMC 2139 bricked itself 
Had it dual-booting Snow Leopard and MX Linux 19.3
Did a few Snow Leopard updates, culminating in EFI 1.1 update I think it was
Followed instructions to shut down from the update screen, then press & hold power button until the light started flashing and a tone sounded
Then it seemed to start the update OK, although progress bar was increasing at a glacial pace
So I left it going, and returned to find it booted into MX
Did a restart from MX, after which nothing - neither startup chime nor anything on the screen
Tried PRAM reset, also holding down power button again, to no avail - latter makes light start flashing, but then nothing
And Firmware Restoration CD 1.4 doesn't work - perhaps because the questionable DVD drive can't read a rewriteable CD
I can't even eject the CD by holding down trackpad button at power on - the MacBook starts without startup chime or anything on screen, and seems not to respond to the keyboard
So I reckon my only remaining option is rewrite firmware from a 2MB .FD file extracted from the restoration CD's dmg
But I can't find the EFI chip which I assume is a SOIC8

Had it dual-booting Snow Leopard and MX Linux 19.3
Did a few Snow Leopard updates, culminating in EFI 1.1 update I think it was
Followed instructions to shut down from the update screen, then press & hold power button until the light started flashing and a tone sounded
Then it seemed to start the update OK, although progress bar was increasing at a glacial pace
So I left it going, and returned to find it booted into MX

Did a restart from MX, after which nothing - neither startup chime nor anything on the screen
Tried PRAM reset, also holding down power button again, to no avail - latter makes light start flashing, but then nothing
And Firmware Restoration CD 1.4 doesn't work - perhaps because the questionable DVD drive can't read a rewriteable CD
I can't even eject the CD by holding down trackpad button at power on - the MacBook starts without startup chime or anything on screen, and seems not to respond to the keyboard
So I reckon my only remaining option is rewrite firmware from a 2MB .FD file extracted from the restoration CD's dmg
But I can't find the EFI chip which I assume is a SOIC8

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