Please mighty mattytrog help me! I started trying to flash my new Trinket M0 in preparation for installing, but something went wrong. I connected the Trinket to my PC, pressed reset twice, got into Trinketboot and copied the latest Trinket M0 Part 1 Dual Boot bootloader uf2 from the OP, then the drive unmounted, and now I can't get back in to flash the Part 2 file. It won't even show the default circuit-whatever drive when I plug it into my PC. I'm not sure what I did wrong, but I'm concerned I managed to brick my Trinket.
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Deleted-172301
Guest
Was finally able to get switchboot to work! I noticed that if I kept the USB cable plugged in when switchboot was trying to trigger. The switch would stay in RCM mode. All I needed to do was boot without it plugged in. 
Yep that's correct behaviour. That's why we have the USB strap to kick-start the console upon usb disconnectionWas finally able to get switchboot to work! I noticed that if I kept the USB cable plugged in when switchboot was trying to trigger. The switch would stay in RCM mode. All I needed to do was boot without it plugged in.
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Which file did you use? Was it definitely the UF2?
Yep, "Part_1_TRINKET_DUAL_BOOT_Latest.uf2" from the first post was the file I used. Could I have used the wrong copy method? I just dragged it from my download folder to the drive entry in the Windows 10 side bar like I'd copy files to any other drive.
Thats correct. Is the filesize 512kb?
Have you triedpowering off, then sending the update payload again? Then double-press reset leaving half-second gap?
The Part 1 file is 20KB, Part 2 is 512KB. That's just it, I can't resend it. When I connect the Trinket to my PC nothing shows up. Originally, the default circuitpy drive would show up, then I'd double press and Trinketboot would replace it. Now nothing loads. Device manager says the Trinket is connected, it just doesn't want to show any of the storage options.
EDIT:
I`m checking my files out. They are showinfg the same my end. Be right back.
@SStitches
Scrub that... The files are fine. You are flashing part1 file. Indeed 19.2kb. Sorry I am not awake yet!
Last edited by mattytrog,
The part1 files are 19.2kb. That is correct size. Like I say - I wasn`t awake and severely hung over!
Are there any lights on your chip at all? If so, just experiment with different "double-press" reset button timings. Leave half second between presses.
The middle LED is gree, the bottom right LED is green, and the bottom left LED is breathing red/orange. I've been trying various double press timings all afternoon, I can't get the UF2 drive to show up. The tutorials I watched all had the UF2 drive re-mount automatically after flashing Part 1, mine never did that. Would this be the result if I brain farted and copied part 2 first instead? Or should it still work the same?
If it breathing red-orange, it isn`t bricked. You need to hard-power off (hold for 12 seconds), resend the SAMD21 update payload and it should pop up if its breathing.
Oh. I see.
Most peculiar. If it hasn`t been fitted yet and it is breathing, it should be showing up. Try a different usb port or cable.
Yes that is correct. All your lights are correct. The red LED will be fading dark to bright - breathing.
What are you getting in device manager? Not using anything that interferes with USB port are you? eg virtualbox?
Nup, just normal Windows 10 Pro and a regular run-of-the-mill USB 2.0 port. Device manager says the Trinket is there under USB devices. If I unplug the Trinket and plug it back in, the bottom left LED doesn't breathe until I press the reset button. It just stays dimly lit, that helpful at all?
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