The following is a step by step guide to upgrade your older devices to a custom rom The benefits include - seamless usage - less lag - less overheating - greater optimization
Firstly, go to lineage os. Find your device and download the lineage os according to your phone model number Download odin 3 on your computer and download magisk or any other alt software on your phone Custom boot your phone after installing the software or use odin 3 to download the custom boot launcher There, copy paste your lineage software to your phone and apply it but before applying make sure you erase all data on your phone. Boom now you have a phone running on a newer os