If you are interested, it is available online; shows up in a google search for your phrase
Li-fe 250 electric scooter
as a PDF link in the fourth hit. (adding the word "manual" to the phrase makes it the first hit)
The search result page includes a quote from the PDF of "4. Your scooter is fitted with a rear brake light which will
illuminate automatically whenever you pull the brake lever." That gives you something to check for.
If it turns out that there aren't any error codes in there, you could contact the manufacturer via the info at the end of the manual to see if they have those codes.
If it turns out there aren't any error codes at all, perhaps the blinking simply means the brake is engaged, per the quoted phrase above.
Beyond that, we'd need more info on the specific test(s) already done (what test was done and how it was done and what the exact results were), and what happened just before the problem started.**** Then we can suggest other tests that might provide useful information to help you troubleshoot it.
****almost always, there is something that happened to the device people come here to ask for help with, that they did not bother to tell us about but was the key to helping them find the problem to fix it. Some of them even insist nothing happened, until some days or weeks down the line they say, well, nothing except for that crash, or that rainstorm, or that time it fell in a river, etc.
