I tested those two files on windows 7 last night... updated ok. boot into windows 7 without hitch. Below are my result
see attached img --> Image Folder -s21-windows7-test
anyrom_with_marvell_drivers_win7_ssd
asus_stockrom_0903_with_marvell_win7_ssd
asus_stockrom_0903_with_standard_ahci_win7_ssd
w10rom_with_marvell_drivers_win7_ssd
w10rom_with_standard_ahci_drivers_win7_ssd
will post windows 10 result later
see attached img --> Image Folder -s21-windows7-test
anyrom_with_marvell_drivers_win7_ssd
asus_stockrom_0903_with_marvell_win7_ssd
asus_stockrom_0903_with_standard_ahci_win7_ssd
w10rom_with_marvell_drivers_win7_ssd
w10rom_with_standard_ahci_drivers_win7_ssd
will post windows 10 result later