System
IBM PowerPC G4 1.42 GHz
512MB DDR SDRAM for Desktop
80GB HDD
Intel Core 2 Duo 2.26 GHz
4GB DDR3 SDRAM for Laptop
160GB HDD
iMac 10,1 (21.5-inch, Late 2009)
3.06GHz Intel Core 2 Duo processor with 3MB shared L2 cache
iMac 12,1 (21.5-inch, Mid 2011)
2.5GHz quad-core Intel Core i5 with 6MB on-chip shared L3 cache
Command+Option+R (Network Recovery) only works for wired network.
Install Windows 10
It needs to download Boot Camp 5.1.5621 first to install Windows 10 1507 (Threshold 1) 10240.16384 by DVD in legacy BIOS mode and then upgrade by the latest Windows 10 22H2 (Vibranium) 19045.4894 on USB stick, thereby avoiding the igdkmd64.sys crash problem in EFI mode.
https://os.click/ can download the very first Windows 10 1507 (Threshold 1) 10240.16384 that can burn into DVD single layer.
https://support.apple.com/en-us/106412 can download Boot Camp 5.1.5621.
https://www.reddit.com/r/bootcamp/comments/y5etid/keep_getting_this_error_after_installing_windows/
https://www.reddit.com/r/bootcamp/comments/150boe8/installing_windows_10_on_imac_mid_2011_without/