nRF52840 flashing issue

[hsme1st3rrr]

Hi everyone,
I haven't found any discussions on this topic yet. I'm trying to flash my nRF52840 custom board, which I bought on AliExpress. It's named "nRF52840 SuperMini, Nice!Nano compatible." I attempted to flash it in VS Code using the nRF Connect extensions, but the flashing failed due to the UF2 bootloader (I saw that some people use Virtual COM for flashing).

I also bought a CMSIS-DAPLink programmer from AliExpress (the one with the USB option). Unfortunately, I bricked it, but I managed to restore it using custom firmware for ST-LINK V2. However, the LED is no longer blinking, and while the nRF Connect Programmer detects my DAPLink, it says, "No operations possible for device. If the device is an MCUboot device, make sure it is in bootloader mode."

Double-tapping RST to GND doesn't put it in DFU mode; it just resets, and the UF2 content folder appears. I've tried to find other bootloaders for DAPLink or this nRF board, but haven't had any success.
OS:Windows 10
nRF SDK: 2.6.9
UF2 Content:

UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
Model: nice!nano
Board-ID: nRF52840-nicenano
SoftDevice: S140 version 6.1.1
Date: Jun 19 2021

[Susheel Nuguru]

Not sure where you bought that chip, but can you show me the laser markings on the chip? 

but the flashing failed due to the UF2 bootloader (I saw that some people use Virtual COM for flashing).

You should ask the module maker about this, it does not look like a module we know or understand. 

[hsme1st3rrr]

Can you recommend which modules are compatible with nRF?

[Susheel Nuguru]

You can check this here -> third party modules.

[hsme1st3rrr]

Thanks a lot! I guess I got wrong firmware on board. Would you help me where can I find binary or hex with stock firmware for nRF52840 ic? 

[Susheel Nuguru]

The chip is factory programmed to have the right settings in FICR. With those intact, you can can try any example folder from here and go into the "hex" directory to find the hex file you can use to test. Note that the precompiled hex files are made for nRF development boards, so the logging/LED and buttons might work different for you if your kit have different pins connected to buttons/LEDs/uart_pins

[hsme1st3rrr]

Thanks for the reply! Now, the last problem is how to flash it to my board. Also, I have an ST-LINK, but it does not solve the flashing issue.

[Susheel Nuguru]

What the UF2 bootloader is doing and why it is not allowing flashing is something you should ask the module maker.

Also the chip that you posted "Geehy", I do not know what that is, but that does not look Nordic.