Android Se Custom Rom Development (Expert Only)

Hello We want to create many custom rom for this devices : Samsung galaxy S2 or S3 Xtreamer 4.7'' Joyz Android box tv (We search a good box without AOSP rom) and maybe others... If you develop many custom rom with android SE in the past, and you know to insert them into the BootRom (factory seetings) and also to remove the reset possibility and others security faillure, Please contact us and we will provide you the Features details... We search expert in this domain to make a long terme relationship. Best Regards