Hacking Hardware Picofly - a HWFLY switch modchip

[Dk2022]

I regularly use 91/47/47 or 91/51/51 when the 47ohm resistors run out. I never have slow memory problems or other issue. I didn't buy 100ohm resistors because I already had a large amount of 91ohm resistors.

 

[LogicalMadness]

oh, it's really simple - I had only 47 and 210 ohm resistors. The 47 ones worked, and the 210 ones didn't.
If 100 ones work better for you, use them

So there's no specific resistance target in the FW? Just 'some resistance til it works' as a general rule, no FW involved?

 

[deeps]

oh, it's really simple - I had only 47 and 210 ohm resistors. The 47 ones worked, and the 210 ones didn't.
If 100 ones work better for you, use them

is this good enough for you to update the guide yet, @lightninjay?

 

[FreeLander]

I regularly use 91/47/47 or 91/51/51 when the 47ohm resistors run out. I never have slow memory problems or other issue. I didn't buy 100ohm resistors because I already had a large amount of 91ohm resistors.

I got the 'slow emmc" message that was fixed by adding a 100ohm resistor only twice in my 100+ installations. That's why I don't choose to do it regularly.

 

[lightninjay]

is this good enough for you to update the guide yet, @lightninjay?

I feel like the suggestion to add two 47 ohm resistors is still sufficient. A smart enough modder will be able to infer that replacing such a setup with a 100 ohm resistor would be an equivalent setup.

 

[unchil]

I installed pico rp2040 on my oled. Every connection looks ok but it doesnt work. Im getting 2 short blinks (rst not connected error) and it boots to normal os.
Rst point has 1,5 value in diode mode test if its connected to pico. Without conection is 2.7. Also pico starts right after connecting the battery without pressing the power button. Is it suppose to be like that?
Where could be the problem?

 

[rehius]

Also pico starts right after connecting the battery without pressing the power button. Is it suppose to be like that?

this means you have connected the 3.3v wire to the wrong position (direct battery 4.2v). the caps are pretty similar

 

[unchil]

this means you have connected the 3.3v wire to the wrong position (direct battery 4.2v). the caps are pretty similar

holy... This was so obvious... Thanks

 

[cicci084]

Good morning guys. I need an instant curing light/laser.
Some lamps that take a few seconds to harden the UV resin. Which one do you recommend?

 

[unchil]

this means you have connected the 3.3v wire to the wrong position (direct battery 4.2v). the caps are pretty similar

Now pico starts ok but it gives me en error =*== emmc test faliure - read failed

 

[MichiS97]

Good morning guys. I need an instant curing light/laser.
Some lamps that take a few seconds to harden the UV resin. Which one do you recommend?

I've got this one and I think it's really good:
Professional 10W UV Glue Curing Lamp USB Ultraviolet LED Purple Light Plug & Play Used for Phone Circuit Board Repairing
https://a.aliexpress.com/_Ev7PbHV

 

[abal1000x]

Good morning guys. I need an instant curing light/laser.
Some lamps that take a few seconds to harden the UV resin. Which one do you recommend?

Search in this thread, @lightninjay told some recomendation. And i had confirmed its works in seconds (between 15-50s) under transparent uv resin.

https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/post-10193981

 

[Phantomas77]

Well, probably it's just me, but in 3 different consoles that I tried, I never got them to work with a single MOSFET (IRFHS8342 from Digikey, 0.31mm wires on S&D, 100/100/47 and 47/47/47 config, RP2040-zero FW2.73):

- OLED soldered to CPU cap --> ==* (CPU always reach BCT check (no glitch reaction, check mosfet)
- OLED soldered in the back (deeps and Abal points) --> ==*
- Erista unpatched soldered in the back (Abal's points) --> glitched few times and than ==*

Some thoughts that came into my mind:

• should I add another MOSFET so the current will be higher?
• since the back points are more distant to the SoC than the "original" caps, is the distance enough to affect the glitch?
• should I stick to double MOSFET on SoC caps as usual? Probably I will.
• what am I missing here?

Would like to hear your thoughts on this

 

[Flash93]

Has there been any confirmation on the Home Button LED mod working for the V1/V2 yet?

 

[LogicalMadness]

Search in this thread, @lightninjay told some recomendation. And i had confirmed its works in seconds (between 15-50s) under transparent uv resin.

https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/post-10193981

 

[bvang913]

A few pages back there was some conversation about those bootleg RP2040 Tiny's and the LED not working properly. I ended up with a few and yes I can confirm the led codes do not appear when the chip is installed. Luckily the install was a success, but if it wasn't I wouldn't be able to tell what the issue is. Has anyone found a workaround to get these LEDs working properly? Thanks.

 

[jkyoho]

A few pages back there was some conversation about those bootleg RP2040 Tiny's and the LED not working properly. I ended up with a few and yes I can confirm the led codes do not appear when the chip is installed. Luckily the install was a success, but if it wasn't I wouldn't be able to tell what the issue is. Has anyone found a workaround to get these LEDs working properly? Thanks.

Do you have WS logo on your back of rp2040 tiny PCB?

 

[karatefeet]

A few pages back there was some conversation about those bootleg RP2040 Tiny's and the LED not working properly. I ended up with a few and yes I can confirm the led codes do not appear when the chip is installed. Luckily the install was a success, but if it wasn't I wouldn't be able to tell what the issue is. Has anyone found a workaround to get these LEDs working properly? Thanks.

I haven't found a solution. Have tried swapping the led and the chip next to the voltage regulator from a zero with no difference.

What I've been doing is initially flashing to v2.67 to get the led back. Then once confirmed the install is good, update via pico toolbox to v2.75.

 

[unchil]

My pico in oled shows =*== error - emmc test faliure, read failed. Console boots to normal os.
My diode mode values looks like below
0.614 dat0
0.68 cmd
0.73 clk
1.5 rst
0,62 cpu
Every connnection and every resistor looks ok. Emmc adapter looks like on the photo. Where can I look for the problem?

 

[bvang913]

Do you have WS logo on your back of rp2040 tiny PCB?

Nope doesn't have it. I bought real ones from the same store, but when I reordered more these were those ones with the big connector.

I haven't found a solution. Have tried swapping the led and the chip next to the voltage regulator from a zero with no difference.

What I've been doing is initially flashing to v2.67 to get the led back. Then once confirmed the install is good, update via pico toolbox to v2.75.

That sounds good. I'll give that a try for my next install. Thanks