Sorry, I have not tested UU. Since it is difficult for us to know the specific blocked areas and blocking methods of GFW, I think it is better to use a proxy server (rather than game booster like UU) that can access websites such as Google to...
Hello, are you also located in China Mainland? (i got it from your profile) I think it's due to GFW block. Using proxy can solve this problem.
Homebrew software doesn't seem to follow the system proxy settings, try using a transparent proxy.
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi