@xiaoM4095 Thanks for the very well craafted installation steps and effort. Finally after a second SSD installation, I could Install and use Catalina in my Y540 (i5+1650). My M.2 was PM981a so Only option was a 2.5 SATA SSD. Did everything as mentioned in First posts. Number pad and touch pad, even dragging is working.
I have a serious issue going on.
1. My wireless Lapair USB2.0 2.4GHz WiFi Adapter (RTL8188CU) outputs very low data speed on only mac OS, in windows works pretty good. I have installed
https://github.com/chris1111/Wireless-USB-Adapter driver latest v14, no improvement.
2. I can't add or create apple id inside system preferences, I get a message saying Apple ID valid but not an iCloud account when I login, and I get too many responses in create request when I click create apple ID. I did create a second ID by safari and didn't go well.
Is there a permanent solution for these. I know its a compatible WiFi adapter, getting only 100 KBPS in downloading where in windows its over 5 MBPS(Not good but that's normal in INDIA). I wish there is a si=oltion for that. Without the network it's all going to be a waste of time and work for me. As for Apple ID I have been trying whatever I can do, but no single change. Always the same result. Even contacted apple advisor and stopped right when she asked for serial number and model
.
Sorry I couldn't attach screenshots of apple Id issue, Because I'm posting this from windows, in mac OS its snail fast speed to even surf internet.