Just updated a Fritz!Box 7490 with 7.21. Simply go to System | Update.
These links are referral codes
Geekzone broadband switch | Eletricity comparison and switch | Hatch investment (NZ$ 10 bonus if NZ$100 deposited within 30 days) | Sharesies | Mighty Ape | Backblaze | Coinbase | TheMarket | My technology disclosure
Nice, will check it out.
PSA for those who use Yeelight products YMMV, some of these will not work with WPA3.