If you are using hwfly-nx firmware 0.6 or above, you can hold vol+ and vol- while powering on to bypass the modchip completely and boot directly into stock sysnand.
If you try hold vol+ and vol- while powering on and it doesn't boot OFW then you don't have 0.6.0, then you can't use the hwfly toolbox to update either. You might have an unflashable chip if you have older V1 or V2.
If you try hold vol+ and vol- while powering on and it doesn't boot OFW then you don't have 0.6.0, then you can't use the hwfly toolbox to update either. You might have an unflashable chip if you have older V1 or V2.