Canon releases firmware updates for many DLSRs because of issues with EF 70-300mm f/4-5.6 IS II and EF-S 18-135mm f/3.5-5.6 IS USM lenses
Canon released firmware updates for almost every DSLR released before 2015. It's because many Canon DSLRs have issues with the EF 70-300mm f/4-5.6 IS II and EF-S 18-135mm f/3.5-5.6 IS USM lenses.…