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Signature is now visible but it was not before. On checking things out on the Net, I now understand why I could not find any specs or info about a ThinkPad X210... That simply does not exist! The computer in question here is not a real Lenovo ThinkPad at all but something made & sold by a Chinese group of enthusiats that goes by the name of 51NB and who re-use ThinkPad shells to fit their own motherboards or provide motherboards to fit into Thinkpad shells. Coreboot firmware in place of a standard/stock BIOS... why not? https://geoff.greer.fm/2019/03/04/thinkpad-x210/ I'm not saying the machine is bad but this belongs more to the DIY classification than anything else. Bearing this in mind + the fact the BIOS current firmware fitted to the motherboard is not what we would call usual standard, I would not expect too much in terms of chances to fully or properly run macOS on this platform. Too many unknowns (but one must love the unusual 2880x1920 LCD panel) and, as you experienced yourself, the usual Hackintosh settings just don't work. PS: I took the liberty of modifying your signature + thread title because we don't want to mislead anyone with this... "ThinkPad".

There is renewed development on the matter of Realtek's RTS52xx SD card reader building on Sinetek's initial work : https://www.insanelymac.com/forum/topic/321080-sineteks-driver-for-realtek-rtsx-sdhc-card-readers/?do=findComment&comment=2713476 https://github.com/cholonam/Sinetek-rtsx I've tried out Cholonam's Sinetek-rtsx kext v1.0 on my Latitude 7490 and it's now possible to read (and only read) an SD card once inserted in the reader. It can be ejected and re-inserted at will; it's just a little slow to mount (~10s) and Read-Only. Works after wake too. Supported models appear to include: RTS5209 / RTS5227 / RTS5229 /RTS522a / RTS5249 / RTS5286 / RTS5287 / RTS5289 / RTS525a

New update as of June 2021. See our article here. The above is now deprecated. Much improved kext written by Firewolf (aka Austere.J) available here: https://github.com/0xFireWolf/RealtekCardReader/releases

New version v2.4 released. Aims to improve sleep/wake behaviour with RTS5227 reader.

New version v2.2 released today with bug fixes.