Hacking Hardware Picofly - a HWFLY switch modchip

binkinator · Feb 4, 2023

vittorio said:
https://github.com/wyattearp/ghidra_uf2loader on ghidra you can try this

Post automatically merged: Feb 4, 2023

i think the (bool)isCurrentModePrivileged() method blocks by id

Post automatically merged: Feb 4, 2023

https://forums.raspberrypi.com/viewtopic.php?t=336409

Post automatically merged: Feb 4, 2023

can anyone try this

What a fantastic read! It’s where we are now…just 6-7 months earlier.

Did you make some changes hence the request for test?

Did you have to do anything special wrt the two sections of encryption?

(I don’t have my Pico wired up in my switch…still working on getting a logic analyzer working fast enough to follow HWFLY.)

saladus · Feb 4, 2023

vittorio said:
can anyone try this

@Tafty may you do the honors?

SylverReZ · Feb 4, 2023

AntonIX said:
Hey, just found leaked sources about how hwfly works.

Post automatically merged: Feb 3, 2023

Also I read on 4pda thats fpga used to fastly generate rsa keys to emulate cartridge. I am not completely understand what does it mean. Looks like it is wrong machine translate.

Thanks for the great catch.

Post automatically merged: Feb 4, 2023

binkinator said:
What a fantastic read! It’s where we are now…just 6-7 months earlier.

This sure has been a rather interesting read. I can't wait to see how this progress goes into making this possible.

Tafty · Feb 4, 2023

saladus said:
@Tafty may you do the honors?

this one doesnt do anything.

once you put the uf2 on the pico it reboots it to load it...but just goes straight back into bootloader mode where its waiting for a uf2 to be put on it again.

edit checked another one aswell just incase, same thing

saladus · Feb 4, 2023

damn, unfortunate

vittorio · Feb 5, 2023

Not work?

saladus · Feb 5, 2023

vittorio · Feb 5, 2023

the function should be the one according to that post, I have to see if with ghidra I can see the functions better

FruithatMods · Feb 5, 2023

AntonIX said:
Hey, just found leaked sources about how hwfly works.

Post automatically merged: Feb 3, 2023

Also I read on 4pda thats fpga used to fastly generate rsa keys to emulate cartridge. I am not completely understand what does it mean. Looks like it is wrong machine translate.

Can you provide a link to the exact post?

binkinator · Feb 5, 2023

FruithatMods said:
Can you provide a link to the exact post?

Posted here: https://gbatemp.net/threads/pikofly-a-probably-fake-hwfly-modchips-or-not.622701/post-10064859

e: save you some time

FruithatMods · Feb 5, 2023

It looks like the original post was deleted...

pixxel13 · Feb 5, 2023

What do we already know about this "modchip"?

impeeza · Feb 5, 2023

pixxel13 said:
What do we already know about this "modchip"?

Everything what is on this thread.

pixxel13 · Feb 5, 2023

impeeza said:
Everything what is on this thread.

Yes I just read everything, but have we gotten it to work yet or have we found a way to make it work? because most of the things you talked about I don't understand much, I just wanted to know

Tafty · Feb 5, 2023

pixxel13 said:
Yes I just read everything, but have we gotten it to work yet or have we found a way to make it work? because most of the things you talked about I don't understand much, I just wanted to know

At the minute we have proof it does work, but no one is willing to share the original files to make it work, so the short end of it is currently some of the guys in this thread are reverse engineering the dumped firmware from one.

The first hurdle is getting past the encryption

pixxel13 · Feb 5, 2023

Tafty said:
At the minute we have proof it does work, but no one is willing to share the original files to make it work, so the short end of it is currently some of the guys in this thread are reverse engineering the dumped firmware from one.

The first hurdle is getting past the encryption

That's pretty cool, I'm really invested in this, if I can help with anything let me know

vittorio · Feb 5, 2023

then the firmware once written does a get id and encrypts everything and saves the id, when you dump the file is encrypted but the functions to compare the id are not

Piorjade · Feb 5, 2023

I've created a repository for an eMMC interface using the RPi Pico, I haven't and currently can't even test it out in reality, though in theory I currently have a CLK signal, CMD sending (48bit packages) and CMD receiving (48bit and 136bit responses, is set when sending to determine which state machine to use, though probably can be even more optimized)

I also have DAT0 receiving, receiving gets triggered through MCU code via an IRQ.

Again, I haven't tested it out at all, I was just following the documentation on the MMC 4.1 interface (downloadable for free on JEDEC's website). Two things missing: I forgot to actively pull the CMD and DAT0 lines to HIGH and also a PIO can only have 32 instructions, which is why I currently don't have DAT0 sending.

I could just load DAT0 sending into the second PIO but my idea was to have everything on one PIO, sadge..

I tried to document what I was doing in the sourcecode, but honestly it's a complete mess and there's still a lot to do.

Anyway, if anyone likes to mess with the Pico's PIOs, here's something to look at I guess:

https://github.com/Overflwn/pico_emmc

TheSynthax · Feb 5, 2023

Piorjade said:
I've created a repository for an eMMC interface using the RPi Pico, I haven't and currently can't even test it out in reality, though in theory I currently have a CLK signal, CMD sending (48bit packages) and CMD receiving (48bit and 136bit responses, is set when sending to determine which state machine to use, though probably can be even more optimized)

I also have DAT0 receiving, receiving gets triggered through MCU code via an IRQ.

Again, I haven't tested it out at all, I was just following the documentation on the MMC 4.1 interface (downloadable for free on JEDEC's website). Two things missing: I forgot to actively pull the CMD and DAT0 lines to HIGH and also a PIO can only have 32 instructions, which is why I currently don't have DAT0 sending.

I could just load DAT0 sending into the second PIO but my idea was to have everything on one PIO, sadge..

I tried to document what I was doing in the sourcecode, but honestly it's a complete mess and there's still a lot to do.

Anyway, if anyone likes to mess with the Pico's PIOs, here's something to look at I guess:

https://github.com/Overflwn/pico_emmc

Would you be able to make a sketch to dump the raw bus traffic over USB serial? If so, I'll connect a Pico to my Switch and see if this is able to sniff the bus.

Piorjade · Feb 5, 2023

TheSynthax said:
Would you be able to make a sketch to dump the raw bus traffic over USB serial? If so, I'll connect a Pico to my Switch and see if this is able to sniff the bus.

To sniff the bus, we'd need PIO code that reacts to the Switch's CLK signal, I haven't done that yet. This code currently produces its own CLK signal so it's more useful for reading/writing to eMMC independently from the Switch.

I'll take a look at it tomorrow, maybe I'll figure something out.
I guess one idea would be that this code is specifically for writing the payload to the eMMC (hold RESET pin so that the Switch doesn't interfere -> start CLK and write payload to the eMMC) and after writing the payload we'd have to (re-)start the Switch anyway and that's where the "sniffing PIO code" comes in.

Honestly, even though only sniffing the eMMC data shouldn't do any damage to the Switch, I'm kind of scared of trying to hook it up to an actual Switch

The eMMC communication is basically the first important half of the Picofly and honestly I'm surprised that I couldn't find ANYTHING regarding somebody implementing the eMMC protocol on Picos as this is a public and popular type of flash storage..

Other than that, I don't know if I really should dive deeper into this topic after I've successfully implemented the eMMC protocol, big N's ninjas have eyes everywhere.

Hacking Hardware Picofly - a HWFLY switch modchip

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