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Is this an ISP programmer for AVR or STM?
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Neither. It's a USB-to-Serial converter with what might or might not be an FTDI chip.
Thank you
With some finagling, I believe ATMegas with the Arduino bootloader can be programmed using straight serial - you just have to time the reset pulse carefully.
I don't think you can use it as an actual AVR programmer for new bootloaders, fuses etc. though. You need a full MCU for that. If you have a spare Arduino or ATMega that is happy, you can use 'Arduino as ISP' to do it.