820-00850 no turn on

[geo8610]

NOT AVALAIBLE HISTORY
DFU MODE IS NOT RECOGNIZED

PP3V3_G3H=3.3v
PP5V_G3S=5.1
PPBUS_G3H=12.35
PP3V3_G3H_RTC=3.3
PP1V8_SLPS2R=3.3V
PP1V2_S3=0V
PPVCCEDRAM_S0_REG_R=0V

 

[2informaticos]

All USB-C ports switch to 20V?
Test disconnecting battery (87W charger only).

You can try reflashing SoC ROM; should enter into DFU automatically.

 

[geo8610]

yes,all ports switch 20v
test disconnecting battery same problem
with which adapter reflashing this memory Rom U4770? I have programmer sofi sp8-a, I don't know if I work for this chip

 

[2informaticos]

Be aware, is 1V8 chip...

 

[geo8610]

The programmer I have is 3.3v, can this board serve as a 1.8 adapter?
A4069 Level Shifter to 1.8 volt with Solder Spaces

 

[2informaticos]

Yes, it works.
It is explained on the product page.

 

[geo8610]

ok, the board A4069 works for the soc rom U4770, says uson 3X4 page product that works for me?

 

[2informaticos]

Why not, if has USON 3x4mm?

"Connect 3v3 side to Medusa and solder a 1v8 ROM onto this board."
Connect 3V3 side to your programmer, instead of Medusa.

 

[geo8610]

no, solo preguntaba; entonces A4069 me sirve soc rom para U4770

 

[geo8610]

I already programmed and dfu enters but an error appears when I try to restore or revive in dfu mode it appears installing the system dfu error appears

 

[2informaticos]

What is the error?

 

[geo8610]

this error

 

[2informaticos]

AC2 shows DFU, or Recovery?
If appears in Recovery, force the target Mac of and try to put it in DFU again.

 

[geo8610]

machine always remains in dfu.Now error

 

[2informaticos]

Put back original dump and try again DFU...

 

[geo8610]

when placing original dump it enters dfu, however when restoring/reviving this error appears

 

[2informaticos]

Blank/erase SoC ROM and try again DFU.

 

[geo8610]

te refieres que borre la rom, y la coloque sin programar e intentar por dfu?

 

[2informaticos]

Exactamente...

 

[geo8610]

ok, erase soc rom, machine same problem revive dfu