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New 90NB0B10-R00020 X540LJ REV2.1 Mainboard For ASUS X540L F540L X540LJ Laptop Motherboard 4G/I3-4005U GT920M (V2G) - AliExpress
X540LJ REV:2.1 With SR27G I3-5005U CPU N16V-GM-B1 High Quality Mainboard For ASUS X540LJ Laptop Motherboard 100% Full Tested OK - AliExpress
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Asus X515MA Intel CDC N4020 SSD Upgrade Tutorial - YouTube
ASUS Vivobook X540 Series Disassembly, SSD Upgrade; RAM, CPU, Motherboard, Battery - Jody Bruchon - YouTube