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TH3D error

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I'm trying to flash my Ender 3 Pro using TH3D software. I have loaded a boot loader but when I go to flash the Marlin 2 software I get an error. the error message is " ser_open () : can't set com-state for ".\COM3" I have tried over com ports as well. ( COM5, COM4 etc) Any help would be greatly appreciated.

Do you have a 32 bit board ???

The printer is only a week or so old and has the stock board in it. I was wondering if that might be the problem and have ordered a new mother board for it. It's suppose to have Marlin 2.0 installed along with the boot loader on it.

Thank you for the reply

Yes Marlin is for 32 bit boards, Below is a good guide on installation etc

https://www.youtube.com/watch?v=_IafavTl1fA