I don't know how the AERA 500 was upgraded to 550. I have already compared Shtyrman's reg16 with my reg16 - they are identical. So there are probably reg's that we don't know about.
I don't know how the AERA 500 was upgraded to 550. I have already compared Shtyrman's reg16 with my reg16 - they are identical. So there are probably reg's that we don't know about.
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