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I need detail guide on how to install Big Sur on my dell latitude E5470 core i5 laptop. Thanks guys.

touchpad not working or no gesture? Assuming you have Intel Wifi /BT, you need to add kexts for them. Should be able to find with some googling.

It was successful Jake. Thanks a-lot. only issues are wireless and bluetooth. They are not working and touchpad is also not working but I think I am ok. I am using both external mouse and Tplink usb wifi dongle.

Hervé has a pretty thorough guide here for BS with OpenCore. Follow steps 1, 2 and 3 Use bootpack from here for E5470, rename the folder to EFI If you don't have a Mac to do this, then you'll just have to google for a Windows guide, plenty of guides out there. Just replace the EFI folder with one I linked