MECLR1 jumper in Dell desktop such as Inspiron 660 or 3650

The MECLR1 jumper is present on motherboard of at least the two abovementioned motherboard.

Dell provides no documentation on these.  I accidently discovered this jumper as I was looking for the CMOS CLR jumper.  Note the silkscreen on mobo is tiny and hard to see at edge of motherboard.  A bright LED lamp may help.

Here is the question:  3650 users report that if the motherboard is bricked due to a failed BIOS update (let's say done by Windows update or SA), moving this jumper would make the board boot again. "Change the Jumper MECLR1 from 1-2 to 2-3, and it will boot as normal."

"Confirmed, this worked for me after bios update failed and the inspiron 3650 was stuck in a boot loop"

this jumper sounds like a programmer's back door reminiscent of that in Matrix #2.  Does that apply to other Dell desktop mobo if it happens to have such a undocumented covert back door to allow Dell engineer but not ordinary user to make a bricked mobo POST again. 

3650 MECLR1 instruction:

1-2 Normal Mode (default)

2-3 disable ME