Windows 11 not updating to Windows 11 Insider Preview Feature Update (26220.7051)

Respected Madams/Sirs,

I am facing a very unexpected problem while updating to Windows 11 Insider Preview Feature Update (26220.7051), which encounters an error and says, "couldn't extend system reserved partition". My disk has a lot of free space available, but the EFI, of course, was full with 6mb left, so I had to extend its capacity. To fix this, I tried numerous methods, but they eventually proved fruitless.

1. Tried extending the EFI size (currently 100 MB) using GParted, but couldn't, so created a new EFI with a 500 MB size. Executed the necessary steps and commands to make sure the computer used the new EFI as its primary EFI. The computer boots using the new EFI, but the update error hasn't gone.
2. Tried clearing unnecessary files from the original EFI. Nothing worked.
3. Tried cleaning my hard disk, which of course might not be the key for this since the error is related to EFI, not the hard disk itself. Still, nothing worked. 

To put it short, I may have tried every method possible, but nothing has worked. I urgently require assistance.

My current Windows version is Windows 11 Home, version 24H2, OS build is 26120.6982, on a Dell Inspiron Laptop

Please help.

Thanks!