I have debloated the final lollipop firmware for Infinix X600 16+1 and the link to download is below. Upgrade using latest flashtool. This is a complete firmware so it is also possible to downgrade using it from Marshmallow for those facing issues as we wait for stable 6.0
Some added stuff include:
Reduced DPI to 255
Google Messenger as the default messaging app
New ringtones and notification tones
Increased performance
DOWNLOAD
Pw: androidhq254.blogspot.com
CONTACT ME INCASE OF ANY ISSUES