Cannot resize file system on SD card with gparted or fdisk

Hello there,
FIrst of all, I am complete beginner. I burned OpenWrt on SD card for raspberry 4. It worked and I got OpenWrt up and running and I can login with ssh and with the GUI on the browser. Great success for me.
I have an instruction for first time users on Youtube which shows how to expand the partition using fdisk. I did it with a previous version and it worked. Now I tried out with the recent version and I found differences.
The last partition names were: boot and rootfs, now the partition names are boot and disk. This does not have great impact for me, but it is different. Then however I do not succeed in changing the disk partition. When I try it with fdisk and do a file system check I get a lot of errors. When I try with gparted it is not possible at all to resize the disk partition.
How can i resize the partition ?
Thank you very much for any advice. I have seen also a similar question on banana pi, but this is from 2022. With the previous version I succeeded, therefore I think it is different.
Thank you very much and please, be mild with me, I am really newbee ....

Don't follow random videos on YT.

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