A: If the phone is under warranty (rare for V9 now), yes. Otherwise, they may charge a flashing fee. The DIY method above costs you nothing but time.
When flashing, it is highly recommended to uncheck or backup partitions like to avoid losing your vivo v9 loader
Once you fix your Vivo V9 using a loader tool, follow these rules to avoid doing it again next week: A: If the phone is under warranty (rare for V9 now), yes
A: Yes, for Vivo devices – though the V9 is now legacy. vivo v9 loader