Seems no one mentioned it but I hope you have that heat tape on a t-stat. Set it to around 88-90F and I would at least offer the snake a hide to feel comfortable in. Even my 6'+ girl uses a hide sometimes when shedding or when she just wants privacy. Feeling secure will go a long ways with a boa as all of mine are complete loungers except my BCL who are just extra shy by nature and take longer to settle in than BCIs. But even now he is pretty laid back for the most part.
Give him a hide like I said and let him shed and relax and he will most likely come around. You can snake hook train if you want but I haven't use a hook for any of my boas ever and then one time I tried a hook on my retic as a baby, he got pissed and opened his mouth and hissed at it. Now I just slide a door open and in about 30 secs, he realizes no food and is curious to hang out with me lol.
Thanks!
Its on t-stat yes. Will try with open enclosure so he can come out alone and i will try to lift him up.... I would like him to eat first and than try this few days later