Problem with ?? unknown

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Hello guys, I am newish at this drone stuff, and I bought a second-hand cloud reptile 149, all working until , one day one motor stopped working ( just giving small bz bzz bz - then the drone boots up again )

I have gone into the betaflight, did tests, and I have changed the motor controller, same problem, changed motors, same problem.

The only thing I can think of is changing the FC . remember I am new and don't know about specifics test and stuff, just general things.

In betaflight all things ok , but that 1 motor

This is the original part

Reptile CLOUD-149 / 149 HD Spare Part 20x20mm F4 OSD 2-4S Flight Controller Integrated with BEC for RC Drone FPV Racing

Only US$25.99, buy best Reptile CLOUD-149 / 149 HD Spare Part 20x20mm F4 OSD 2-4S Flight Controller Integrated with BEC for RC Drone FPV Racing sale online store at wholesale price.

usa.banggood.com

i want to change it to 6S so i found this ?? DOES THIS WORK ??

https://es.aliexpress.com/item/1005004144767792.html?spm=a2g0o.productlist.main.33.27bd673d7dcFVg&algo_pvid=8761e6d7-7e25-45ca-b83d-e02c3779fc21&algo_exp_id=8761e6d7-7e25-45ca-b83d-e02c3779fc21-16&pdp_ext_f=%7B%22sku_id%22%3A%2212000028180808180%22%7D&pdp_npi=3%40dis%21EUR%2144.83%2122.41%21%21%21%21%21%40214527c616765163008713773d06d3%2112000028180808180%21sea%21ES%21714368121&curPageLogUid=vVv1T2WFSncK

So yeah..changed the motor controller, same problem, changed motors, same problem. so FC last resort ?