Update cheatsheets

linux/fwupdmgr

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fwupdmgr
+
+> A tool for updating device firmware, including UEFI, using `fwupd`.
+> More information: <https://fwupd.org/>.
+
+- Display all devices detected by fwupd:
+
+`fwupdmgr get-devices`
+
+- Download the latest firmware metadata from LVFS:
+
+`fwupdmgr refresh`
+
+- List the updates available for devices on your system:
+
+`fwupdmgr get-updates`
+
+- Install firmware updates:
+
+`fwupdmgr update`