I recently bought a digispark starter attiny85, but I haven't been able to use it at all. At first, I couldn't recognize it with my computer, so I flashed the micronucleus bootloader onto it. Seemed to work, but I still can't recognize it, both on windows and linux. When I plug it in, the computer doesn't even seem to realize that anything was plugged in. Before flashing, the red light would flash after I plugged it in, but now there is just a constant green light (no red, there are two seperate leds). Is it faulty, or did I do something wrong?
How did you flash it, if not recognized?
I flashed it using an arduino uno
Not sure I can advise you how to revive it other than to use the Uno, but you need the digistump or newer core / board. Apparently the ATTinyCore have support for these boards.
Windows needs a driver (it's out there somewhere..) and Linux have built-in?
Maybe both 
Here's something to consider when you upload the bootloader:
It needs to be option 2.
Reset pin = Reset
Clock = 16.5 MHz
Try program this with your Uno, and I hope you get it back to life.
I just did it again with the same settings you suggested (If its important, the programmer i used was Arduino as ISP). Same result (it appears to have worked), but it still isn't recognized. I downloaded all the drivers I could find for windows earlier.
Hi @felix_g. Unlike most Arduino boards, the Digispark doesn't use a serial port for communication with the computer. So it is normal and expected that you won't see a serial port appear in Arduino IDE's Tools > Port menu when using this board.
So unless you have some other reason for thinking the board is not working, then I recommend against spending any more time messing with the bootloader.
Please try this:
- Disconnect the Digispark from your computer.
- Select the appropriate board from Arduino IDE's Tools > Board menu.
- Select Sketch > Upload from the Arduino IDE menus.
- Watch the black console panel at the bottom of the Arduino IDE window until you see the following message:
> Please plug in the device (will time out in 60 seconds) ... - Connect the Digispark to your computer.
The upload should now proceed and finish successfully.
Let us know whether the upload was successful.
I do know that no port will appear in the menu when using it. What I mean by "unrecognized" is that when it asks me to plug in the device, I plug it in, and nothing happens. After 60 seconds, it just times out. I've tried this on multiple operating systems, and I've used lsusb (linux) & Device Manager (Windows) to see if anything changes once I plug it in. No result.
You picked the 16.5 MHz Clock option?
Yep. Just to make sure, I also tried 16 MHz. Neither worked.
16.5 is needed for the USB timing.
Seems you tested this your Digispark meticulously, so I cannot think of anything else to try.
I just realized that it's only recognizable in one of my usb ports (wierd, all of them work fine with other things like mouse + keyoboard), but arduino ide won't detect it when it prompts me to plug it in (once I plug it in, it only shows up on device manager)
I have similar odd things with my Attiny85 based digisparks. If I connect them to my USB-hub, I need to disconnect all other cables from the hub for them to be detected during upload. Took me a while to figure that out.
I tried on Windows 11, it doesn't work for me too. I also have a post about this.
In order to make all relevant information available to any who are interested in this subject, I'll share a link to @flash8007's topic: