Hacking Hardware Picofly - a HWFLY switch modchip

rehius · Mar 31, 2023

handsom_tomato said:
I often see people saying that they have recently broken their NAND or boot0, but what is the mechanism behind this happening? It might be a good idea to compile a list of things to be aware of to prevent this from happening. What do you think?

oh, it's easy. the "toolbox unlock" breaks boot0, so please use .uf2 unlock

my fault

khuong · Mar 31, 2023

rskL said:
Just a quick question, is everyone using microscopes to solder? Is there something cheap I can use? Seen mixed thoughts on them magnifying headband things

I wouldn't use cheap or opinions..

Good old rule, measure twice, cut once..

Get the right tools, and you won't spend the time or need to fix things afterwards.

These are tiny components, you can easily knock something, over heat, bridge, etc etc.. if you're not skilled at soldering already, it'll be difficult for novices...

You can get a cheap scope/light for soldering on amazon, aliexpress, for 30-100$.

If you wear glasses, magnifying glasses get expensive to make it fit right over glasses, or replace your glasses all together (what I have).

I use a combination of both, however I prefer the scope.. it's much easier... but again.. I wouldn't go "cheap" route.. unless you're skilled, or have spares... or don't mind forking out a lot more money to fix things than to get right equipment

rskL · Mar 31, 2023

QuiTim said:
You need both of them, plus some additional files. There are alot of guides on how to do that (a couple of them in this thread aswell).
Just google "switch homebrew" and you will have all ypur answers because this precedure is the same whichever modchip you use.

Post automatically merged: Mar 31, 2023

I Installed my first one with my camera phone and it was pain in the a**
If you plan on ever doing any smd solderin in the future get a microscope (it does not have to be high end)

QuiTim said:
Wow, great job if you managed to soder those with just a magnifying glass.
What I did was that I put the phone in recording mode with flash on ( so the screen won't shut off and the light stays on). Then suspended the phone on top of 2 soda cans and worked my way with solder in pcb. Midway through this I orderd a microscope because I was not sure I will be able to finish the work since I was knocking my phone over with the solder every 20seconds

I have a phone with really good macro lens so if I find a decent way of mounting it with a big led light it should be fine for this kind of thing?

Could anyone tell me what guage of wire should be used? the enamel copper stuff isn't in normal guage size it's in mm. Also which double sided tape? Or is it all non conductive? Or should I get kapton tape ?

JaRocker · Mar 31, 2023

Kyle46791 said:
Don't try without resistors. My whole nand got corrupted.

Ok well ill be waiting

Post automatically merged: Mar 31, 2023

vittorio said:
try to update hekate

I'm using the latest version

everyonesweird · Mar 31, 2023

Look, Mom, No Microscope!!!!
Will tidy up the wirings and remove the type C port after i fully test firmware v2.6. Waiting for its release..
Thanks everybody!

Sent from my SM-G781B using Tapatalk

QuiTim · Mar 31, 2023

rskL said:
I have a phone with really good macro lens so if I find a decent way of mounting it with a big led light it should be fine for this kind of thing?

Could anyone tell me what guage of wire should be used? the enamel copper stuff isn't in normal guage size it's in mm. Also which double sided tape? Or is it all non conductive? Or should I get kapton tape ?

My phone flashlight did a good job (just start recording with flash on and you are set).
I think it was 30awg for power and 34awg for the rest.
Here is the chart for awg to mm

khuong · Mar 31, 2023

rskL said:
I have a phone with really good macro lens so if I find a decent way of mounting it with a big led light it should be fine for this kind of thing?

Could anyone tell me what guage of wire should be used? the enamel copper stuff isn't in normal guage size it's in mm. Also which double sided tape? Or is it all non conductive? Or should I get kapton tape ?

30-34 AWG.. 24-28AWG for Power/GNDs.

Kapton Tape -- heat resistant and non conductive.. (just loop it, or tape it down)

Flux.. is a must..
Solder + Low Melt Solder (for making removing things easier)
Solder Braid/Wick.. (for removing excess solder/clean up)
70-99% ISO Alch to clean..

Cheap microscope... 99$ CDN..

pamon15 · Mar 31, 2023

After I flashed uf2 to zero, I reset the zero and the LED goes BLUE(3s)->PURPLE(1s)->off, is this normal? If I short the color jumper, it becomes BLUE(3s)->CYAN(1s)->off. I read from the AIO thread that the color should be red after flashing uf2?

Dandan0404 · Mar 31, 2023

khuong said:
30-34 AWG.. 24-28AWG for Power/GNDs.

Oh no, i bought 36awg teflon wire because of sthetix video.. is it okay?

rskL · Mar 31, 2023

So 0.2mm enamel wire or 30awg ul10064, one of them should be fine for the whole job?

linuxares · Mar 31, 2023

Dandan0404 said:
Oh no, i bought 36awg teflon wire because of sthetix video.. is it okay?

probably

chronoss · Mar 31, 2023

QuiTim said:
https://a.aliexpress.com/_mKHkVSO

Be sure to select 47R

Thanks a lot !!!

eseldiem · Mar 31, 2023

Dandan0404 said:
Oh no, i bought 36awg teflon wire because of sthetix video.. is it okay?

It’s perfect. Gold standard.

rehius · Mar 31, 2023

pamon15 said:
After I flashed uf2 to zero, I reset the zero and the LED goes BLUE(3s)->PURPLE(1s)->off, is this normal? If I short the color jumper, it becomes BLUE(3s)->CYAN(1s)->off. I read from the AIO thread that the color should be red after flashing uf2?

BLUE->PURPLE is a correct switch position

RED is a short blink right after you copy the .UF2 file

master_0123 · Mar 31, 2023

I think firmware 2.5 is not compatible with my nand(KLMCG4JETD).The hekate always say "emmc is in slower mode"(eMMC info).And once you laod stock HOS,end with failure and the boot0 is broken .Luckily I had backuped my nand.
When I change back the tx-chip,everything works well.

Post automatically merged: Mar 31, 2023

The left is original boot0, right is changed boot0.The right one is backuped after boot failure.

cowboy619 · Mar 31, 2023

master_0123 said:
View attachment 362358 View attachment 362359 View attachment 362360I think firmware 2.5 is not compatible with my nand(KLMCG4JETD).The hekate always say "emmc is in slower mode"(eMMC info).And once you laod stock HOS,end with failure and the boot0 is broken .Luckily I had backuped my nand.
When I change back the tx-chip,everything works well.

Did you use resistors?

jkyoho · Mar 31, 2023

master_0123 said:
View attachment 362358 View attachment 362359 View attachment 362360I think firmware 2.5 is not compatible with my nand(KLMCG4JETD).The hekate always say "emmc is in slower mode"(eMMC info).And once you laod stock HOS,end with failure and the boot0 is broken .Luckily I had backuped my nand.
When I change back the tx-chip,everything works well.

SHOW your soldering and resistors

rehius · Mar 31, 2023

master_0123 said:
say "emmc is in slower mode"

you need 47 Ohm resistors

master_0123 · Mar 31, 2023

rehius said:
you need 47 Ohm resistors

I have made a board with 47ohm resistors.

rehius · Mar 31, 2023

master_0123 said:
I have made a board with 47ohm resistors.View attachment 362362

such issues like you describe happen because of eMMC lines noise. for example, it could be the excess capacitance caused by your flat cable and header.

the resistors solution was made for rp2040-zero board and direct wires. it may not fit for your board. if possible, place resistors on the other end, closer to the eMMC

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