Welcome to the forum CV.
I converted my 13 year old BP that had only had live. And a 4 yr old + Boa as well.
The two main things for me that contributed to our success were:
1) Skip a complete feeding cycle to insure hunger.
2) Heat the rat's head and neck to around 95 degrees + or - on both sides and back.
The rest of the body can be 10 degrees less, but the head is for the heat signature for the snake.
Stay in the fight, you can do it!
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