Hacking Switch lite booting on OFW (RST problem?)

[loro]

I tried to unlock my Switch Lite with Picofly, but it is starting in OFW directly and pulsing the LED twice. I can't tell if it is a short or long pulse, but I left a GIF below in case I'm mistaken. It seems to be two short pulses (**), which indicates that the RST is not connected according to the documentation. If it were two long pulses (==), it indicates that the CLK is not connected. The problem is that all the solders look great to me and I have the correct reading (I think). I will leave the images I took of the solders and the measurements I took of each point.

I tried using another Picofly board that I am sure works to eliminate a possible problem and the same thing happened. I also tried to redo the welds, especially the CLK (D) and RST (B) points, but the same error persisted.

Measurements in diode mode (+ on GND):

      SP1                          SP2
0             0.11         0.11              0


DAT0 (C) - 0.494
CMD (A) - 0.516
CLK (D) -  0.490
RST (B) - 0.500

3.3V - 0.428

 

[taxco]

The CPU flex? no pic.

Use a multimeter, punt in beep mode.
Messure point to point if the is no break in the flex cable.

 

[loro]

Hi, @taxco.

Thanks for your comment!

I figured out the problem and managed to make it work. I'm finishing assembling the switch and will come back with information for anyone else who has the same problem.

Post automatically merged: Dec 18, 2024

I discovered the problem and I believe it is the same problem for many people, because I researched it and saw many people looking for the solution, but with no answers.

Basically, the FPC cable for the Lite is not in the correct order for connection to the Picofly. I have 5 Picofly 3-in-1 kits and in all of them the FPC for the Lite is wrong. It was probably poorly adapted and many people bought it with a problem, just like me.

Below I will leave images of the order of the FPC cable and the Picofly. The 3.3V and point B are reversed. Incredibly, this allows the Picofly to turn on, but it shows an error in the RST (point B). Luckily, this did not damage anything, but I hope it saves many people with the same problem.

My Picofly:

My FPC for the Lite:

To solve it, just undo the solder on the FPC with the Switch board and connect the wires directly to the Picofly. I cut the FPC at 3.3V and RST (point B), soldered 0.1mm enameled wires and that's it, problem solved!

Important: not all Picofly and FPC are in this order. I have another version of Picofly that has a different order. Always test the points on the board and the FPC with a multimeter to be sure.

 

[chgbagor]

Hi, @taxco.

Thanks for your comment!

I figured out the problem and managed to make it work. I'm finishing assembling the switch and will come back with information for anyone else who has the same problem.

Post automatically merged: Dec 18, 2024

I discovered the problem and I believe it is the same problem for many people, because I researched it and saw many people looking for the solution, but with no answers.

Basically, the FPC cable for the Lite is not in the correct order for connection to the Picofly. I have 5 Picofly 3-in-1 kits and in all of them the FPC for the Lite is wrong. It was probably poorly adapted and many people bought it with a problem, just like me.

Below I will leave images of the order of the FPC cable and the Picofly. The 3.3V and point B are reversed. Incredibly, this allows the Picofly to turn on, but it shows an error in the RST (point B). Luckily, this did not damage anything, but I hope it saves many people with the same problem.

My Picofly:
View attachment 476365

My FPC for the Lite:
View attachment 476364

To solve it, just undo the solder on the FPC with the Switch board and connect the wires directly to the Picofly. I cut the FPC at 3.3V and RST (point B), soldered 0.1mm enameled wires and that's it, problem solved!

Important: not all Picofly and FPC are in this order. I have another version of Picofly that has a different order. Always test the points on the board and the FPC with a multimeter to be sure.

You have saved me so much headache, I stumbled upon the same issue and never thought the FPC ribbon would be in the wrong order. Thank you so much.

 

[CptanPanic]

I just installed this same chip and came here because I have same error. My flex cable is same. I guess I will need to find some wire to fix.