"OTA" just means "Over The Air" - what are you trying to do over-the-air?
Do you mean OTA firmware update ?
You forgot the screenshot!
Probably also need to give details of what BLE you're using, how you're attempting to do the OTA, etc ...
How to write your question to maximize your chances to find a solution.
A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
