Hacking Hardware Picofly - a HWFLY switch modchip

[SQc04]

Quick silly question, can I use the cpu flex cable of a V2 on an oled?

Can be used

 

[rehius]

I think we need to find a relatively easy SDA SCL.

I do not recommend other points, easy to damage. But if you think you are skilled, good luck

Post automatically merged: May 17, 2023

What is SDA and SCL points? Only ok Xiao? Or is It something about 2040 Zero-Tiny too?

all boards are supported. Waveshare pins are 12 (SDA) and 13 (SCL)

Post automatically merged: May 17, 2023

these three red caps give continuity from both sides

are you sure? it is fine to have ~10-15 Ohms there. Continuity is < 1 Ohm.
Check whether OFW boots, that would be an ultimate test.

 

[QuiTim]

Thank you for your reply. I checked with a multimeter. these three red caps give continuity from both sides. The others do not. Do you think the chip is damaged?

View attachment 371945

Check "northridgefix" on youtube. He has a couple of videos troubleshooting this exact chip. I'm sure one of them will match your problem

 

[FreeLander]

The black one in the middle

Thank you. One more thing I should have reported. I would sometimes get a blue screen with White LED. It disappears after re-plugging the battery, sometimes. Does that tell us anything?

Sorry, @rehius for disturbing you.

 

[rsilveira1991]

Hey guys.
Installed Picofly today in V1. Worked on Atmosphere. but original Nand doesnt start. anyone saw that?

 

[angelC992]

I do not recommend other points, easy to damage. But if you think you are skilled, good luck
View attachment 371946

Post automatically merged: May 17, 2023

all boards are supported. Waveshare pins are 12 (SDA) and 13 (SCL)

Mmm I don't understand. In the past I use an 2040Zero with 2.61 firm and everything is ok.

I'm going to mod another Lite with a 2040zero too but 2.70 firm.

I've been away from the forum for a couple of weeks and the SDA and SCL points are new to me.

Is it something important to take into account or can I do it the same as the other time?

 

[rehius]

Thank you. One more thing I should have reported. I would sometimes get a blue screen with White LED. It disappears after re-plugging the battery, sometimes. Does that tell us anything?

Sorry, @rehius for disturbing you.



View attachment 371950

That looks like CYAN light (glitch failure), you should see OFW booting there. My damaged Lite also gave blue screen instead of OFW, so looks like you have similar hardware issues.

Post automatically merged: May 17, 2023

Is it something important to take into account or can I do it the same as the other time?

SDA & SCL are optional, for those who have issues with glitch reliability (single mosfet, too thin wires, glitch works only by pressing RST during console boot). You can do the hack the same way as you did before

 

[FreeLander]

That looks like CYAN light (glitch failure), you should see OFW booting there. My damaged Lite also gave blue screen instead of OFW, so looks like you have similar hardware issues.

Post automatically merged: May 17, 2023

SDA & SCL are optional, for those who have issues with glitch reliability (single mosfet, too thin wires, glitch works only by pressing RST during console boot). You can do the hack the same way as you did before

too bad. I was going to remove the modchip and update my lite to the latest firmware like it says in the post with blue screen. I used the latest version of Picofly but my lite was not updated to the latest firmware.

 

[abal1000x]

.

 

[angelC992]

That looks like CYAN light (glitch failure), you should see OFW booting there. My damaged Lite also gave blue screen instead of OFW, so looks like you have similar hardware issues.

Post automatically merged: May 17, 2023

SDA & SCL are optional, for those who have issues with glitch reliability (single mosfet, too thin wires, glitch works only by pressing RST during console boot). You can do the hack the same way as you did before

Ok, thank you very much. You are great!!

 

[abal1000x]

.

 

[detilmalala]

I track that line to the top pcb and its this (the bottom of the cpu)
View attachment 371965

Its so small (not recommended), but still i do that point, and its work.
So xiao rp2040 with undervoltage glitching is working. I confirmed that.

Thank you rehius, for a very quality firmware.
You are awesome.

great, which board are those alternative points for, oled or lite?

 

[abal1000x]

.

 

[rehius]

great, which board are those alternative points for, oled or lite?

same for all boards. I still suggest to avoid those ones. very easy to rip off

 

[abal1000x]

.

 

[KingMo5h]

i2c for Lite - tested
View attachment 371848

Post automatically merged: May 17, 2023

wrong points

Post automatically merged: May 17, 2023

that is required for proper fuse burning. not a bug.

Where is it exactly on the lite? On the back?
Trying to glitch with other mosfets but its not working, maybe with this itll work.

 

[abal1000x]

.

 

[MAI87]

Hello, I have a new problem with switch lite. picofly programmed correctly 2.67. Correct installation, all points well welded and with a UV mask. all correct values and checked several times but I still have the same problem.
turn on blue and yellow light and boot original system. I don't know if between the blue and yellow light is the white light since everything happens super fast. Does anyone know what the problem is here? I don't know what to try anymore, I ran out of resources and I just think that it might be the nand memory that is not compatible for this job? I hope someone can guide me so I can see the green light on this switch

 

[QuiTim]

Hello, I have a new problem with switch lite. picofly programmed correctly 2.67. Correct installation, all points well welded and with a UV mask. all correct values and checked several times but I still have the same problem.
turn on blue and yellow light and boot original system. I don't know if between the blue and yellow light is the white light since everything happens super fast. Does anyone know what the problem is here? I don't know what to try anymore, I ran out of resources and I just think that it might be the nand memory that is not compatible for this job? I hope someone can guide me so I can see the green light on this switch

I don't think there was a case (yet) of incompatible nand that i've seen.
Do you have any closeup pictures of dat0, clk, and cmd soldering?
*Edit:
or better yet, if you have a spare Pico, flash the new 2.7 firmware on it and connect it. It will give up a more detailed error message.

 

[cowboy619]

Hello, I have a new problem with switch lite. picofly programmed correctly 2.67. Correct installation, all points well welded and with a UV mask. all correct values and checked several times but I still have the same problem.
turn on blue and yellow light and boot original system. I don't know if between the blue and yellow light is the white light since everything happens super fast. Does anyone know what the problem is here? I don't know what to try anymore, I ran out of resources and I just think that it might be the nand memory that is not compatible for this job? I hope someone can guide me so I can see the green light on this switch

What are your values for the sp1 and sp2 points? Usually cpu flex not installed correctly


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