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Internet Archive Wayback Machine comes to rescue: https://web.archive.org/web/20200805190606/https://nitrocaster.me/files/X220.X230_fhd_mod_rev5_v0.2.pdf https:

• matt_heimer 5y ago
  Also, they lowercased some Xs. Its at https://nitrocaster.me/files/x220.x230_fhd_mod_rev5_v0.2.pdf https://nitrocaster.me/files/x220.x230_fhd_mod_rev5_v0.2.pdf and linked to from the product page https://nitrocaster.me/store/x220-x230-fhd-mod-kit.html https://nitrocaster.me/store/x220-x230-fhd-mod-kit.html