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Forum Index : Microcontroller and PC projects : Pi Pico is not recognized for a firmware change.
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| rea23 Newbie  Joined: 16/09/2022 Location: SwitzerlandPosts: 26 |
Something is wrong with one of my USB-C Pico Pi. The Pico no longer appears as a removable disk in Windows Explorer. Otherwise it works normally and programs can be loaded via MMEdit. Is there a possibility to execute a uf2-file, e.g. Clear_Flash.uf2 or a new firmware anyway? Previous attempts: changed USB cable, changed notebook, reset Pico. Without any success. |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6787 |
Holding down Boot while powering up triggers a boot loader to update the flash chip on the Pico. That's the fundamental way to load uf2 files into the flash and it should *always* work. It's the only time that Windows explorer sees it as a virtual drive. Connecting via a virtual COM port at 1200 baud will also trigger the bootloader for firmware updates. If you are programming using the console via USB or MMEdit then you are connecting via a virtual COM port in Windows. That's not a virtual drive. You have to be running some sort of terminal emulator (or MMEdit) on the PC. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
If you are using MMEdit and Windows, simply connect to the pico in MMCC and drag the *.uf2 file onto the MMCC terminal window. That is all you need to do. If you have to use the clearflash.uf2 file, the same applies but once zapped with clearflash, the pico will reboot to a drive ready for copying the mmbasic firmware, just like a blank pico. If you programmed it with the new USB versions of MMBasic, I think you will have to go with holding the boot button while powering up. Jim Edited 2024-02-24 20:37 by TassyJim VK7JH MMedit MMBasic Help |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
There is also the console command:- UPDATE FIRMWARE That also makes it appear as a removable disk in Windows Explorer. |
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| rea23 Newbie Joined: 16/09/2022 Location: SwitzerlandPosts: 26 |
That worked perfectly Many thanks |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
Using mmedit control I got to select com and connect but like teraterm suggests 3 coms and use highest. The usb version I used the same hold prog button and connect usb lead as usual but what happens if I want to reflash as the usb is now usb keyboard, do I use the usb to ttl? |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6787 |
You have to connect the PC to the Pico USB connector and use the Boot button & power up method. I don't think anything else will work. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
yes,the button press and connect usb over rides usb keyboard. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6787 |
That's because the bootloader can't use the COM ports of the RP2040 so the USB-TTL converter isn't seen. It will only work via the USB and while you are running USB firmware the USB port is in the wrong mode. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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