820-3126
iMac 21.5-Inch Mid 2011
iMac12,1
A1311 emc2428
The ROM is a SOIC-8 chip (64Mbit) that can be read or written by the Medusa-3 with a Pomona clip.
The ROM in on the top (easy to reach) side of the motherboard, but hidden behind a cable.
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CMIzapper Technology for your Mac repair business
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