Go to NCBI-site: www.ncbi.nlm.nih.gov
find 'protein' in the left menu, insert your GI-number (only number)
it will give you its identifier.
Your protein new identifier is can be found here
I am not sure what BIF_XXX is but you can get an idea of what the
GI is for by using NCBI unix utils like this.
$ efetch -db protein -id "241190667" -format fasta | grep ">" >YP_002968061.1 carbamoylphosphate synthase large subunit [Bifidobacterium animalis subsp. lactis Bl-04]