-snip-
Bro, help please fined a problem.
0
1FFFFFFFFFFFFFFFFFFFFF
0230210C23B1A047BC9BDBB13448E67DEDDC108946DE6DE639BCC75D47C0216B1B
pubkey less then 85Bytes.
4000 Mkey/sec totla.
-d - default
nothing found in 1,5h Count - 2^42 . Only 1 dead kangaroo.
why not founded 1 privkey ?
How to fix it ?

First you range in not less 85bit but equil to 85bit
Secon bit and bytes very different things..
Third Expected OP for your range = 2^ 43.55
Fourth, the public key must lie in a given range, otherwise it will never be found.
F8ck, Bro. I thin you right !!!