diff --git a/devices/gl-ar750/default.nix b/devices/gl-ar750/default.nix
index a7f18a6..9acc159 100644
--- a/devices/gl-ar750/default.nix
+++ b/devices/gl-ar750/default.nix
@@ -41,10 +41,11 @@
     :ref:`system-outputs-mtdimage` can be flashed using the
     vendor web UI or the U-Boot emergency "unbrick" routine.
 
-    For flashing from an existing Liminix system (we believe that) it
-    is necessary to first boot into a :ref:`system-outputs-kexecboot`
-    system, otherwise you'll be overwriting flash partitions while
-    they're in use - and that might not end well.
+    Flashing over an existing Liminix system is not possible while
+    that system is running, otherwise you'll be overwriting flash
+    partitions while they're in use - and that might not end well.
+    Configure the system with :ref:`levitate` if you need to
+    make it upgradable.
 
     Vendor web page: https://www.gl-inet.com/products/gl-ar750/
 
diff --git a/devices/gl-mt300a/default.nix b/devices/gl-mt300a/default.nix
index d972e44..c5f4379 100644
--- a/devices/gl-mt300a/default.nix
+++ b/devices/gl-mt300a/default.nix
@@ -32,10 +32,11 @@
     binary created by :ref:`system-outputs-mtdimage` can be flashed
     using the vendor web UI or the U-Boot emergency "unbrick" routine.
 
-    For flashing from an existing Liminix system (we think) it
-    is necessary to first boot into a :ref:`system-outputs-kexecboot`
-    system, otherwise you'll be overwriting flash partitions while
-    they're in use - and that might not end well.
+    Flashing over an existing Liminix system is not possible while
+    that system is running, otherwise you'll be overwriting flash
+    partitions while they're in use - and that might not end well.
+    Configure the system with :ref:`levitate` if you need to
+    make it upgradable.
 
     Vendor web page: https://www.gl-inet.com/products/gl-mt300a/
 
diff --git a/devices/gl-mt300n-v2/default.nix b/devices/gl-mt300n-v2/default.nix
index 901bfaa..fe82a01 100644
--- a/devices/gl-mt300n-v2/default.nix
+++ b/devices/gl-mt300n-v2/default.nix
@@ -25,10 +25,11 @@
     binary created by :ref:`system-outputs-mtdimage` can be flashed
     using the vendor web UI or the U-Boot emergency "unbrick" routine.
 
-    For flashing from an existing Liminix system (we think) it
-    is necessary to first boot into a :ref:`system-outputs-kexecboot`
-    system, otherwise you'll be overwriting flash partitions while
-    they're in use - and that might not end well.
+    Flashing over an existing Liminix system is not possible while
+    that system is running, otherwise you'll be overwriting flash
+    partitions while they're in use - and that might not end well.
+    Configure the system with :ref:`levitate` if you need to
+    make it upgradable.
 
     Vendor web page: https://www.gl-inet.com/products/gl-mt300n-v2/
 
diff --git a/modules/all-modules.nix b/modules/all-modules.nix
index 982e4f3..326a056 100644
--- a/modules/all-modules.nix
+++ b/modules/all-modules.nix
@@ -22,7 +22,6 @@
    ./outputs/ext4fs.nix
    ./outputs/initramfs.nix
    ./outputs/jffs2.nix
-   ./outputs/kexecboot.nix
    ./outputs/mtdimage.nix
    ./outputs/tftpboot.nix
    ./outputs/ubifs.nix
diff --git a/modules/outputs/kexecboot.nix b/modules/outputs/kexecboot.nix
deleted file mode 100644
index 768b883..0000000
--- a/modules/outputs/kexecboot.nix
+++ /dev/null
@@ -1,65 +0,0 @@
-{
-  config
-, pkgs
-, lib
-, ...
-}:
-let
-  inherit (lib) mkOption types concatStringsSep;
-in {
-  imports = [ ../ramdisk.nix ];
-  options.system.outputs = {
-    kexecboot = mkOption {
-      type = types.package;
-      description = ''
-        kexecboot
-        *********
-
-        Directory containing files needed for kexec booting.
-        Can be copied onto the target device using ssh or similar
-      '';
-    };
-    boot-sh = mkOption {
-      type = types.package;
-      description = ''
-        Shell script to run on the target device that invokes
-        kexec with appropriate options
-      '';
-    };
-  };
-  config = {
-    boot.ramdisk.enable = true;
-    system.outputs = {
-      kexecboot =
-        let o = config.system.outputs; in
-        pkgs.runCommand "kexecboot" {} ''
-          mkdir $out
-          cd $out
-          ln -s ${o.rootfs} rootfs
-          ln -s ${o.kernel} kernel
-          ln -s ${o.manifest} manifest
-          ln -s ${o.boot-sh} boot.sh
-          ln -s ${pkgs.kexec-tools-static}/bin/kexec ./kexec
-          ln -s ${o.dtb} dtb
-       '';
-
-      boot-sh =
-        let
-          inherit (config.system.outputs) rootfs;
-          cmdline = concatStringsSep " " config.boot.commandLine;
-        in
-          pkgs.buildPackages.runCommand "boot.sh.sh" {
-          } ''
-            rootfsStart=${toString (100 * 1024 * 1024)}
-            rootfsBytes=$(stat -L -c %s ${rootfs})
-            append_cmd="mtdparts=phram0:''${rootfsBytes}(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes} memmap=''${rootfsBytes}\$''${rootfsStart}";
-            cat > $out <<EOF
-            #!/bin/sh
-            test -d \$1
-            cd \$1
-            ./kexec -f -d --map-file rootfs@$rootfsStart --dtb dtb --command-line '${cmdline} $append_cmd' kernel
-            EOF
-          '';
-    };
-  };
-}
diff --git a/modules/outputs/mtdimage.nix b/modules/outputs/mtdimage.nix
index 99a09ea..48801ba 100644
--- a/modules/outputs/mtdimage.nix
+++ b/modules/outputs/mtdimage.nix
@@ -34,7 +34,8 @@ in {
         This creates an image called :file:`firmware.bin` suitable for
         squashfs or jffs2 systems. It can be flashed from U-Boot (if
         you have a serial console connection), or on some devices from
-        the vendor firmware, or from a Liminix kexecboot system.
+        the vendor firmware, or from Liminix when using
+        :ref:`levitate`
 
         If you are flashing from U-Boot, the file
         :file:`flash.scr` is a sequence of commands
diff --git a/modules/ramdisk.nix b/modules/ramdisk.nix
index fa8d84a..1e3be6b 100644
--- a/modules/ramdisk.nix
+++ b/modules/ramdisk.nix
@@ -7,8 +7,7 @@ in {
       ramdisk = {
         enable = mkEnableOption ''
           reserving part of memory as
-          an MTD-based RAM disk.  Needed for TFTP booting or for
-          kexec-based revertable upgrade
+          an MTD-based RAM disk.  Needed for TFTP booting
         '';
       };
     };