My HUAWEI Wifi AX3 router shows the date January 1, 1979 and does not provide internet.

Good guys! This is my first time using Reddit and I have a question. The thing is that this morning they changed the main router in the house for one with fiber optics. I use the HUAWEI router as an internet repeater, when I wanted to change the signal so that it now works with the new signal, I realized that the date was changed to January 1, 1970 and that the device that connects it and makes the configurations does not provide internet. Could it be that the new router comes with the date 1970 and that misconfigured my HUAWEI router? I consulted with HUAWEI and they told me to send them the product, but I want that to be the last solution... P.S. I've already factory reset and restarted my router several times, so I don't know what else to do...