diff --git a/krebs/3modules/buildbot/master.nix b/krebs/3modules/buildbot/master.nix
index c365798f3..f23981f44 100644
--- a/krebs/3modules/buildbot/master.nix
+++ b/krebs/3modules/buildbot/master.nix
@@ -2,7 +2,14 @@
 
 with config.krebs.lib;
 let
-  buildbot = pkgs.buildbot;
+
+  nixpkgs-1509 = import (pkgs.fetchFromGitHub {
+    owner = "NixOS"; repo = "nixpkgs-channels";
+    rev = "91371c2bb6e20fc0df7a812332d99c38b21a2bda";
+    sha256 = "1as1i0j9d2n3iap9b471y4x01561r2s3vmjc5281qinirlr4al73";
+  }) {};
+
+  buildbot = nixpkgs-1509.buildbot;
   buildbot-master-config = pkgs.writeText "buildbot-master.cfg" ''
     # -*- python -*-
     from buildbot.plugins import *
diff --git a/krebs/5pkgs/default.nix b/krebs/5pkgs/default.nix
index f0bda0ee1..cdab64212 100644
--- a/krebs/5pkgs/default.nix
+++ b/krebs/5pkgs/default.nix
@@ -38,14 +38,6 @@ with config.krebs.lib;
 
     ReaktorPlugins = callPackage ./Reaktor/plugins.nix {};
 
-    buildbot = callPackage <nixpkgs/pkgs/development/tools/build-managers/buildbot> {
-      inherit (pkgs.pythonPackages) twisted jinja2;
-      dateutil = pkgs.pythonPackages.dateutil_1_5;
-      sqlalchemy_migrate_0_7 = pkgs.pythonPackages.sqlalchemy_migrate_func (pkgs.pythonPackages.sqlalchemy7.override {
-        doCheck = false;
-      });
-    };
-
     # XXX symlinkJoin changed arguments somewhere around nixpkgs d541e0d
     symlinkJoin = { name, paths, ... }@args: let
       x = pkgs.symlinkJoin args;
diff --git a/lass/1systems/mors.nix b/lass/1systems/mors.nix
index f26f0ed5f..d065d4dfa 100644
--- a/lass/1systems/mors.nix
+++ b/lass/1systems/mors.nix
@@ -25,7 +25,6 @@
     ../2configs/c-base.nix
     ../2configs/mail.nix
     ../2configs/krebs-pass.nix
-    ../2configs/umts.nix
     ../2configs/repo-sync.nix
     {
       #risk of rain port
@@ -54,6 +53,16 @@
     #    package = pkgs.postgresql;
     #  };
     #}
+    {
+      lass.umts = {
+        enable = true;
+        modem = "/dev/serial/by-id/usb-Lenovo_F5521gw_38214921FBBBC7B0-if09";
+        initstrings = ''
+          Init1 = AT+CFUN=1
+          Init2 = AT+CGDCONT=1,"IP","pinternet.interkom.de","",0,0
+        '';
+      };
+    }
   ];
 
   krebs.build.host = config.krebs.hosts.mors;
diff --git a/lass/1systems/uriel.nix b/lass/1systems/uriel.nix
index 92996c181..83553f5ca 100644
--- a/lass/1systems/uriel.nix
+++ b/lass/1systems/uriel.nix
@@ -16,6 +16,12 @@ with builtins;
     ../2configs/bitlbee.nix
     ../2configs/weechat.nix
     ../2configs/skype.nix
+    {
+      lass.umts = {
+        enable = true;
+        modem = "/dev/serial/by-id/usb-HUAWEI_Technologies_HUAWEI_Mobile-if00-port0";
+      };
+    }
   ];
 
   krebs.build.host = config.krebs.hosts.uriel;
@@ -33,8 +39,8 @@ with builtins;
     #loader.grub.version = 2;
     #loader.grub.device = "/dev/sda";
 
-    loader.gummiboot.enable = true;
-    loader.gummiboot.timeout = 5;
+    loader.systemd-boot.enable = true;
+    loader.timeout = 5;
 
     initrd.luks.devices = [ { name = "luksroot"; device = "/dev/sda2"; } ];
     initrd.luks.cryptoModules = [ "aes" "sha512" "sha1" "xts" ];
diff --git a/lass/2configs/default.nix b/lass/2configs/default.nix
index 377554514..e3065ba84 100644
--- a/lass/2configs/default.nix
+++ b/lass/2configs/default.nix
@@ -66,7 +66,7 @@ with config.krebs.lib;
     };
   };
 
-  nix.useSandbox = true;
+  nix.useChroot = true;
 
   users.mutableUsers = false;
 
diff --git a/lass/3modules/default.nix b/lass/3modules/default.nix
index b3037205e..6a3b41ca4 100644
--- a/lass/3modules/default.nix
+++ b/lass/3modules/default.nix
@@ -5,6 +5,7 @@ _:
     ./folderPerms.nix
     ./mysql-backup.nix
     ./power-action.nix
+    ./umts.nix
     ./urxvtd.nix
     ./wordpress_nginx.nix
     ./xresources.nix
diff --git a/lass/3modules/power-action.nix b/lass/3modules/power-action.nix
index 3116514a8..30875c9a9 100644
--- a/lass/3modules/power-action.nix
+++ b/lass/3modules/power-action.nix
@@ -12,6 +12,10 @@ let
 
   api = {
     enable = mkEnableOption "power-action";
+    battery = mkOption {
+      type = types.str;
+      default = "BAT0";
+    };
     user = mkOption {
       type = types.user;
       default = {
@@ -80,11 +84,11 @@ let
     "if [ $power -ge ${toString plan.lowerLimit} ] && [ $power -le ${toString plan.upperLimit} ] ${charging_check plan}; then ${plan.action}; fi";
 
   powerlvl = pkgs.writeDash "powerlvl" ''
-    cat /sys/class/power_supply/BAT0/capacity
+    cat /sys/class/power_supply/${cfg.battery}/capacity
   '';
 
   state = pkgs.writeDash "state" ''
-    if [ "$(cat /sys/class/power_supply/BAT0/status)" = "Discharging" ]
+    if [ "$(cat /sys/class/power_supply/${cfg.battery}/status)" = "Discharging" ]
       then echo "false"
       else echo "true"
     fi
diff --git a/lass/2configs/umts.nix b/lass/3modules/umts.nix
similarity index 55%
rename from lass/2configs/umts.nix
rename to lass/3modules/umts.nix
index c1fce9ea2..01adc0409 100644
--- a/lass/2configs/umts.nix
+++ b/lass/3modules/umts.nix
@@ -3,6 +3,36 @@
 with config.krebs.lib;
 
 let
+  cfg = config.lass.umts;
+
+  out = {
+    options.lass.umts = api;
+    config = lib.mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkEnableOption "umts";
+    modem = mkOption {
+      type = types.str;
+      default = "/dev/ttyUSB0";
+    };
+    initstrings = mkOption {
+      type = types.str;
+      default = ''
+        Init1 = ATZ
+        Init2 = ATQ0 V1 E1 S0=0 &C1 &D2
+      '';
+    };
+    username = mkOption {
+      type = types.str;
+      default = "default";
+    };
+    password = mkOption {
+      type = types.str;
+      default = "default";
+    };
+  };
+
   nixpkgs-1509 = import (pkgs.fetchFromGitHub {
     owner = "NixOS"; repo = "nixpkgs-channels";
     rev = "91371c2bb6e20fc0df7a812332d99c38b21a2bda";
@@ -11,33 +41,32 @@ let
 
   wvdial = nixpkgs-1509.wvdial; # https://github.com/NixOS/nixpkgs/issues/16113
 
-  modem-device = "/dev/serial/by-id/usb-Lenovo_F5521gw_38214921FBBBC7B0-if09";
+  #modem-device = "/dev/serial/by-id/usb-Lenovo_F5521gw_38214921FBBBC7B0-if09";
+  modem-device = "/dev/serial/by-id/usb-HUAWEI_Technologies_HUAWEI_Mobile-if00-port0";
 
   # TODO: currently it is only netzclub
   umts-bin = pkgs.writeScriptBin "umts" ''
     #!/bin/sh
     set -euf
-    systemctl stop wpa_supplicant
     systemctl start umts
-    trap "systemctl stop umts && systemctl start wpa_supplicant;trap - INT TERM EXIT;exit" INT TERM EXIT
+    trap "systemctl stop umts;trap - INT TERM EXIT;exit" INT TERM EXIT
     echo nameserver 8.8.8.8 | tee -a /etc/resolv.conf
     journalctl -xfu umts
   '';
 
   wvdial-defaults = ''
-    Modem = ${modem-device}
-    Init1 = AT+CFUN=1
-    Init2 = AT+CGDCONT=1,"IP","pinternet.interkom.de","",0,0
+    Modem = ${cfg.modem}
+    ${cfg.initstrings}
+    Modem Type = Analog Modem
     Baud = 460800
     phone= *99#
-    Username = netzclub
-    Password = netzclub
+    Username = ${cfg.username}
+    Password = ${cfg.password}
     Stupid Mode = 1
     Idle Seconds = 0
   '';
 
-
-  out = {
+  imp = {
     environment.shellAliases = {
       umts = "sudo ${umts-bin}/bin/umts";
     };
@@ -58,5 +87,5 @@ let
       };
     };
   };
-in out
 
+in out