I'm having a bit of an issue. I haven't been able to upgrade the software through the OS and I'm on 5.21. I've flashed a USB/external HDD with 5.24 and tried to boot from it to install the lastest update but it won't boot from the USB. I've had a look at the manual upgrade also but it's installed on the internal HDD of my Dell.
I'm not sure what else I can try.