Can you upgrade the RAM of an Android device?
You can't. Most smart phones are designed as a System-on-Chip; which means that the CPU, RAM, GPU, device controllers, etc are all in a single chip. Updating RAM in such system means replacing a whole lot of other stuffs. Not to mention that you probably would have a hard time finding a chip with different specification which fits perfectly into the hole that was left behind after you dismounted the chip; due to size restrictions, the components around the chip are designed to fit tightly into the available space.