modify rate limiting?

I made a mistake with rate limiting settings on the user manager for a couple hotels I just added.

I flipped the tx and rx fields, not thinking of the rate limit affecting the out interface.

Now I printed 300 fancy vouchers for the hotel and the user can only download at 128k but upload at 1mb, where the hotels cable modem is 15m down and 1m up.

Does anyone know a way to modify rate limits in bulk, I have spent the last hour modifying them by hand and only have 50 done.

download csv, modify, delete, upload csv?
But I cannot find upload csv.

Thanks

hope this can work

/tool user-manager user print
:for i from=1 to=xxx do=[set $i rate-limit=“64k/256k”]

where xxx is the number of user