There are various reports of the new D5500 firmware knocking out AF on Sigma lenses, one such account can be seen here
Re: D5500 firmware update aparently affected a Sigma lens focus ability: Nikon DX SLR (D40-D90, D3000-D7200) Talk Forum: Digital Photography Review
Proceed with caution if you are using third party lenses !!
Re: D5500 firmware update aparently affected a Sigma lens focus ability: Nikon DX SLR (D40-D90, D3000-D7200) Talk Forum: Digital Photography Review
Proceed with caution if you are using third party lenses !!