Picofly 2040 Problems

[mike130504]

Hello guys, i bought a Nintendo Switch Oled a few weeks ago and i modded it with a 2040 kit from Ali-Express. I saw, before buying it, that SKHynix eMMC chips had some problems with the 2040, especially with the resistor configuration.

I managed to mod mine myself and it worked first try but, as lucky as i am, i got one with Hynix eMMC and it was no longer booting official firmware. Also i noticed that it was giving me more and more *== error, i redid the solder joint 3 times and i made sure it's not touching ground but i still had that error. At first it happened 1 time in 10 tries, then like 5 in 10 and in the end it was a 50/50 situation, so i tried to train my picofly again by resetting training data and the console gave me an instant purple screen. It booted after 5 tries and i saw that the internal eMMC partition table was completely empty and i was greeted by an eMMC in slow mode message, never happened before, it stayed at 400MB/s even without booting cfw.

I have a full eMMC backup and it restored successfully, and now it works as before. Today i tried searching for the resistor configuration needed to make my oled work as intended but i found mixed opinions and couldn't understand the resistor size.

I took some mesuranments:

Spoiler: Mesuranments

Spoiler: Board

If someone can suggest resistor type and values i'd be more than happy, thanks

 

[thesjaakspoiler]

OLEDs wwith SKHynix eMMCs are really really picky about those resistor values.
What 'always' worked from my colleague, didn't work for me so take a look at this thread for some suggestions and start trying.
https://gbatemp.net/threads/picofly...sappear-after-rebooting.657060/#post-10447635
Maybe ask in the picofly thread for advice as that is the place with people who mod devices for a living.
https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/

 

[Nephiel]

Spoiler: Board

View attachment 506514

Do you have the flex cable fully inserted and the connector latch closed? Looks disconnected in that picture.

 

[mike130504]

OLEDs wwith SKHynix eMMCs are really really picky about those resistor values.
What 'always' worked from my colleague, didn't work for me so take a look at this thread for some suggestions and start trying.
https://gbatemp.net/threads/picofly...sappear-after-rebooting.657060/#post-10447635
Maybe ask in the picofly thread for advice as that is the place with people who mod devices for a living.
https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/

Ok thanks, i will try to swap them, what size do you think they are? They seem 0201 to me

Do you have the flex cable fully inserted and the connector latch closed? Looks disconnected in that picture.

yeah it was just for testing

Post automatically merged: May 24, 2025

OLEDs wwith SKHynix eMMCs are really really picky about those resistor values.
What 'always' worked from my colleague, didn't work for me so take a look at this thread for some suggestions and start trying.
https://gbatemp.net/threads/picofly...sappear-after-rebooting.657060/#post-10447635
Maybe ask in the picofly thread for advice as that is the place with people who mod devices for a living.
https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/

i tried different resistors, i added 47 ohms to CMD and 100 ohms to the dat0 point but still no boot but it got past the nintendo logo only to get stuck on nintendo switch logo. I also added 100 ohm resistor to Dat0. What resistor config worked for you?