Flashing the firmware can sometimes fail, but most of the time it is nothing major. Before going deeper into issues related to flashing your printer, there are some initial steps and prerequisites that should be tested.
First of all, please try to use another USB port of your computer. Then hit the Rescan button in the Firmware flasher tool in PrusaSlicer.
Make sure the USB cable is inserted all the way on both sides, and maybe try another cable as well.
The Firmware Updater tool is not getting a response from the mini RAMBo or EINSY RAMBo board. Check that your printer is powered on. The next step is to check your fuses, you can visit these articles for more information: Blown Fuse (MK2S/MK2.5/MK2.5S) or Blown Fuse (MK3/MK3S/MK3S+).
"Wrong file has been selected for flashing". Make sure to unpack the .zip archive with the firmware and select the .hex file for your printer model.
Sometimes, the printer is showing up in Device manager, but not among COM devices - If you can find the printer in the device manager, but not as a COM device, follow these steps:
If the Firmware flasher gives you an error saying it is not able to communicate on COM3 or another port, check your Port settings - some other device may be using that port. Eject that device, or change its com port to another number, and restart your computer.
After flashing the firmware, does your LCD show only squares? If the LCD and menu were working correctly before the firmware update, then firmware for different a printer model was flashed. Make sure you selected the correct one (MK2.5S/ MK3S/ Multimaterial).
The core of the printer's system (bootloader) is "read-only" which means that even if you upload an incorrect firmware or make any other mistake, there is always a way to make things right. The best practice when uploading or flashing simply does not work is to follow the steps for a Factory reset (MK2S/MK2.5S/MK3S) of all data.
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