How to erase Adafruit Feather nRF52 Bluefruit LE

Hello,

I have been working with Adafruit Feather nRF52 Bluefruit LE for my project, I have two of these modules.

Recently, while I uploaded code into it and push the reset button suddenly code stopped working and Red led goes in Dimmer Loop code. Then I changed the Code to simple LED Blink code, again while resetting controlled Red led goes in a dimmer loop.

The same issue happens when I start the UART Serial Monitor or Turn the power off-on. I tried the same configuration with other controller but same code work perfectly fine even after any kind of reset to the module (Push Button, Power Restart, UART Serial Monitor).

Is there a way I can factory reset this module?

Link have some videos and Configuration setting of Port 6 controller which having issues. But another controller Port 7 works fine with same code

https://drive.google.com/drive/folders/1B-KOaVJvTHf0_YNyekeshMlugpItaWex?usp=sharing

Thank you.

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