Thanks for your query.Based on the facts that you have posted it appears that your husband has Azoospermia
As his testicular biopsy
shows no evidence of spermatognesis it is practically impossible for you to get any sperm from the testis for ICSI
You have to unfortunately accept the reality. and try for other mode of being pregnant like using semen from Donor.
Advice and guidance of a qualified Infertility
Specialist will be of much help to you.