OLED boots straight to OFW 1/20 times

[linkref]

Hello,

I've modded an OLED switch with pico rp2040 board ready to solder, everything went well.
Everything is okay, but i tried like 100 boots for training, and 1 time every 20 boots the switch boots straight to OFW and error code is : short - short - long (**=)
If it happens, i just have to turn it off and turn it on and then it will glitch well.

Any ideas what to check ?

Thanks

 

[thesjaakspoiler]

I'll guess it's the resistor values but we need some more details for that.
But maybe ask the experts in the official picofly thread :
https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/page-733#post-10343371

 

[linkref]

I've soldered an hwfly-like pico based, with felxes.

 

[Doctorbeefy]

**= No eMMC block 1 read (should not happen)

This is the error

 

[linkref]

Ok but what do you suggest, i have good readings value everywhere

 

[Doctorbeefy]

Ok but what do you suggest, i have good readings value everywhere

something is going wrong with reading the emmc when launching. Maybe there is something slightly off with that.

 

[superfiege]

Hi there. I had exactly the same issue on an OLED some times ago. I first wanted to try to solder the aditional 2 i2c wires but then i decided to switch the chip and used an instict v6. This solved the problem for me.

 

[thesjaakspoiler]

Some of those Chinese picofly knock-offs have the wrong resistor values.
just take a multimeter and measure them.
They should be 47 ohm, not 470 or zero ohms.