(Note that ISRG Root X2 is an ECDSA root and is only relevant if you're using ECDSA. Old Androids are known to be buggy regarding ECDSA, so I wouldn't recommend them anyway if supporting old Android is your concern).
(Note that ISRG Root X2 is an ECDSA root and is only relevant if you're using ECDSA. Old Androids are known to be buggy regarding ECDSA, so I wouldn't recommend them anyway if supporting old Android is your concern).