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Recovering a Bricked UM3

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Copied from someone else - I didn't write 99% of what is below but I think it's very useful - especially if you are messing with json files on your UM3 and it stops booting.

you'll find a recovery image here: recovery.img.

You can install this update by putting this image in a micro sd card - but don't just copy the file there you have to do a special process to make it a bootable sd card.

here is a nice guide on putting a disk image on a sd card:

https://www.hifiberry.com/build/documentation/create-sd-card-from-img-file/

If you are working with MacOS, you can better use ApplePie baker:

https://www.tweaking4all.com/software/macosx-software/macosx-apple-pi-baker/

applepie.thumb.jpg.084102e774fabdfd82d3e95c2dd2b168.jpg

• Insert the Micro SD card in your computer.

• Use the IMG recipe section and search for the file.

• Click on the Restore Backup button.

• Once that is done you can put the SD card back in the printer and check if it boots correctly.

Then, removing the plastic cap in front of the olimex board (it is located on the bottom of your printer), find the SD card slot and insert the SD card:

The SD card slot is located on the smaller board in the back. (Where the network cable connects into)

sd.thumb.jpeg.4e1e45f11503c76a9ca93fe13a672e15.jpeg

In order to reach it you will need to remove the micro USB cable in front of it

5a334060e43dc_sdslot.thumb.jpeg.44b7577fc11788490277f78b4c73407f.jpeg

Now, booting up (only once) with the sd card inserted, wait until a green light goes on on the led ring around the control knob.

The display will also tell you to remove the sd card and reboot.

After all this you probably want to update to the latest firmware as I'm not sure that the link above will always be the latest but the printer will know if it is the latest or not.

Please message me with more details that you learn as I have never tried this with an Olimex board (I've done the same basic procedure on a Beagle Bone Black).

Edited by Guest
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A few notes

- You don’t leave this clear. But um3 doesn’t have a microsdcard on the slot, so is important to buy one if you don’t have one.

- ESD is, according to UM, important.

- Connecting a HDMI monitor/tv to the hdmi port allows to see the bootup sequence, this is useful to see what fails (if someone doesn’t want to reflash all)

- This method removes all data from cores calibration, etc. So one will need to recalibrate everything, core 2 lift mechanism included.

-Olimex sells a usb to serial cable that allows the user to access the linux directly, this is useful if the error doesn’t start the basic ssh services or the user didn’t activated the dev mode. The cable cost very little.

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-Olimex sells a usb to serial cable that allows the user to access the linux directly, this is useful if the error doesn’t start the basic ssh services or the user didn’t activated the dev mode. The cable cost very little.

Oh! I forgot about that! So if I'm going to mess with the json files on my UM3, I think I'd rather buy this cable and connect it to my laptop and just login through that and undo whatever I did to break it.

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-Olimex sells a usb to serial cable that allows the user to access the linux directly, this is useful if the error doesn’t start the basic ssh services or the user didn’t activated the dev mode. The cable cost very little.

Oh! I forgot about that! So if I'm going to mess with the json files on my UM3, I think I'd rather buy this cable and connect it to my laptop and just login through that and undo whatever I did to break it.

Yea that’s what I did when I tried to disable the security of the printer and it became a brick

https://www.olimex.com/Products/Components/Cables/USB-Serial-Cable/USB-Serial-Cable-F/

The instructions are on their website and is just 5€

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