parts-quick 16GB Memory for HP ZBook 15 G5 Mobile Workstation Compatible RAM Upgrade DDR4-2666 SoDIMM at Amazon.com
BDL51 LA-D711P Rev:1.0 Laptop Motherboard for HP 255 G5 w/ AMD A8-7410 | eBay
HP 255 G4 Notebook PC Repair - iFixit
HP 255 G5 Sostituzione Hard Disk con SSD, upgrade with ssd - YouTube
Tropical Computers - Durable. Equipped for Business. Ready for the road! Introducing the HP 255 G5 Notebook. PROMOTION - Only: $1,195.00 DOUBLE the memory to 8GB for only $75 more. Rest assured
HP 255 15.6 inch G9 Notebook PC
HP 250 G6 HDD/SSD and RAM Upgrade Guide - YouTube
How to replace HDD on SSD, upgrade RAM DDR3 from 4GB on 8GB in HP 250 G5 laptop - YouTube