[lambda_tango]

No ARM CPU, but there was an aftermarket conversion called the X62[0], with upgraded display and Intel Broadwell CPU. I think it's mostly been supplanted by an X201 conversion, the X210[1].

[0]: https://geoff.greer.fm/2019/03/04/thinkpad-x210/

[1] http://www.cnmod.cn/x210/