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– To install this modified BIOS from a bootable USB drive, see the instructions here. This modified BIOS will also enable advanced settings and improve battery life under macOS. Install the modified BIOS version 1.46 to remove the whitelist check and permit the installation of a Wi-Fi card compatible with macOS.Please use our contact form if you find anything that isn’t accurate.See the guide here to dual-boot OS X and Windows.See the guide here to install OS X 10.10 Yosemite on the ThinkPad X220.
#Install os x el capitan target disk update
If you already have OS X 10.10 Yosemite on your X220 we recommend doing a clean installation of El Capitan, not an update from the existing installation.Videos demonstrating OS X 10.11 El Capitan running on the X220 can be viewed here and here.See the ThinkPad X220 Mojave guides here ThinkPad X220 OS X 10.11 El Capitan Installation Guideįollow these steps to perform a clean installation of OS X 10.11 El Capitan on your ThinkPad X220 or X220 Tablet. To me it seems best to firstly investigate and solve the memory problem (2.) (which apparently is present)? Or am I heading a wrong way?This guide is no longer being updated. I don't know whether the two (potential) problems are independent from one another or whether perhaps the memory problem (2.) caused the OS system problem (1.).?! (would there be something to be watched out for while doing this, such as at the first restart after a change of RAM?) If one cannot tell, I shall go ahead and carry out some dozens of tests, I think, with the one or the other pair of RAM modules removed. I am wondering whether one can tell which of the four RAM modules is the (occasionally) faulty one? (I suppose this is clearly a RAM error.) Only sometimes this (or a similar) error is diagnosed (in the extended test only, anyway). I had the diagnosis (hardware test) run (option-D at startup), and once it (again) showed a memory error: 4MEM/62/40000000: 0x88e61518. Is that the way it's supposed to be? Is it rather a source of the problem? Help by simply deleting a number of files / folders from the HD.?Ģ. Within "Library", there are about 60 subfolders.īut within "System", there is another folder named "Library" which contains about 97 subfolders - most of them seem to correspond to the subfolders in the upper-level "Library" folder. In the file system of the iMac, as visible in the Finder, I have the folders > Notice - new kext, v13.2.1 matches prelinked kext but can't determine if executables are the same (noUUIDs). > Sun Jan 31 (more stuff here) Early Boot complete. > tzinit: New update not compatible or older version: 2020a.1.0 vs 2020a.1.0: No such file or directory > Warning: couldn't block sleep during cache update > Warning: kextd unavailable proceeding w/o lock for > LibBootCache: Unable to open: /var/db/aylist: 2 No such file or directory In the verbose output, I have these lines: And there is something in the iMac's file system which makes me wonder, whether a former OS installation / update went wrong, such that (in a way) two systems are installed in parallel which again creates a problem. I looked at the lines which show up in verbose mode (CMD-V at startup). There are two points I am wondering about.ġ. Basically (and I summarise), I typed into Terminal (and that part was very simple) a date (2017) that as a consequence made the certificate appear valid. So I tried following the instructions here (link below) and these worked for me. I then remembered reading that there was a different issue some people had encountered, trying to install El Capitan on an older computer, because the installation's signing certificate was now out of date. Last week I bought a replacement battery and tried to get El Capitan installed. I read somewhere that this could cause problems. I gave up trying eventually (ran out of options) but wondered whether it was the lack of battery that was causing the problem (battery had swollen and so I'd ditched it, running it from the mains instead). It got to the point where I tried all sorts, including internet recovery. I don't know if this will prove of any help but…Ī while back I tried to update my white MacBook (early 2009) to El Capitan (from Snow Leopard).