File size not detected nor updated when using new protocol.

[MarsTechHAN]

if require_protocol_v2

The program will not detect the target chip type, so on Line 306,

fprintf(stderr, "File size exceeded device's capacity!\n");

Will be triggered for all time.

---

Also, README should be updated with new IC support.

[MarsTechHAN]

Download still failed :(

sudo wchisptool -n  -f ~/Downloads/usb_device_cdc.bin
Binary length 3746
Now performing erase...
Erase done
Writing Flash
Write done
Verifying Flash
Write failed!

[rgwan]

Debugging, please wait.