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Reading your post, i suspect the problem may be the bricked chip which was disconnected while previous "write" attempt due to an intermittent hardware contact somewhere. Check the reset pin of the CPU. If that doesn't work, try using a new firmware chip.

I'm building a new desktop PC, a Core Ultra 9 285k with an Asus Z-890 motherboard. I paid an exorbitant price for 32GB of 6400 MHz CL32 RAM, essentially triple what it cost a few months ago.
Unfortunately, this situation is set to get worse. SSDs are also rapidly rising in price, and all products that use memory are set to increase significantly.
A few days ago, Raspberry Pi announced its new price list, with a steep increase for the various models based on the RAM installed.

SSDs are now twice what they was in July and is still rising. I am dual booting my system with two Windows OS. The secondary system set up to never be connected to the net for running Altium and other software that is know for notoriously calling home. I ordered/built my system in July 2025 and the thought was. Why not throw in an extra SATA SSD just to do that. They are so cheap anyway.

I'm building a new desktop PC, a Core Ultra 9 285k with an Asus Z-890 motherboard. I paid an exorbitant price for 32GB of 6400 MHz CL32 RAM, essentially triple what it cost a few months ago.
Unfortunately, this situation is set to get worse. SSDs are also rapidly rising in price, and all products that use memory are set to increase significantly.
A few days ago, Raspberry Pi announced its new price list, with a steep increase for the various models based on the RAM installed.

I built myself a new PC in summer last year after watching prices for half a year and procrastinating. 128GB RAM, 5700 TI GPU, 2x4TB nVME. I also upgraded the RAM in my HP mini that I use in the living room from 32GB to 64GB.

The 32GB RAM upgrade is now four times the price I paid. I simply couldn't afford to build the PC at today's prices. At a quick look, it's well over double the price.

For once in my life, I got my timing right on the pricing.

Things are going from bad to worse. My 6400MT/s CL32 kit cost more than four times more than when I bought it in June. And a 64 GB kit is in the range of a Nvidia RTX 5080 GPU. 

Check this
https://en.eeworld.com.cn/news/mcu/eic163572.html

I suggest to use rtx51 instead.

Thanks for the suggestion.
Unfortunately, RTX51 is discontinued & last version of it doesn't support the Nuvoton/Megawin controllers I wish to use.

While my application isn't super complex, I need real-time response for 1 task, which I am unable to get through normal superloop/interrupt structure. For the same reason, I would prefer Preemptive kernel over cooperative.

_sam_des

I suggest to use rtx51 instead.

In Windows(10/11) go to control panel and open device manager - look at the USB connection when you plug in and plug out your USB connector.
Whether your USB device is detected and add to the list of USB devices - you have a software comparability issue
Whether your USB device detected with "yellow question Flag" you have driver issue - replace or update the driver, replace the chip or check and verify connection (Green wire in the USB cable go to DP and white go to DN) also don't forget the GND wire (black))
Whether one wire is missing or connected wrong USB bus will show you a yellow flag with the USB driver
whether all the written above went OK , you probably have software comparability issue - replace or update the control software or use a USB monitor to verify communication.

all the best

Bobi 

Thanks for taking the time to help.
unfortunately , as of now the USB is not being detected at all. at first it was not being detected either but after a little resoldering and cleaning i got it to detect in an unstable connection. so I suppose as AI suggested this is a hardware issue but i can't figure out where to check/modify again. I know the schematics and PCB are OK because those are provided by TI so It has to be something else.

can any one post an example code for dspic30f20 based single phase SPWM solar inverter