diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9d8dcd19..7d69903d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+ - Addes luascript `hf_mf_em_util.lua` - Script for emulator configuration (@nisgola)
  - Fixes `hf mf restore` - now takes bin/eml/json as dump files (@iceman1001)
  - Fixes `script run some_python_script` segfault on armhf architecture (@doegox)
  - Added `trace extract` - extract authentication parts from trace (@iceman1001)
diff --git a/client/luascripts/hf_mf_em_util.lua b/client/luascripts/hf_mf_em_util.lua
new file mode 100644
index 000000000..69537d7dd
--- /dev/null
+++ b/client/luascripts/hf_mf_em_util.lua
@@ -0,0 +1,108 @@
+local getopt = require('getopt')
+local ansicolors = require('ansicolors')
+
+--Copyright
+copyright = ''
+author = 'nisgola'
+version = 'v1'
+
+-- Script description
+desc = [[
+This is a script that write Sector Trailers to the emulator memory.
+
+By default, both keys A and B are set to 0xFFFFFFFFFFFF.
+The Access Bytes are set to 0xFF0780 and User Bytes to 0x00.
+]]
+example = [[
+    -- Use default formatting
+    1. script run hf_mf_em_util
+
+    -- Change keys A and B
+    2. script run hf_mf_em_util -a 112233445566 -b AABBCCDDEEFF
+
+    -- Define access bits and User byte
+    3. script run hf_mf_em_util -x 00f0ff -u 12
+]]
+-- Usage info
+usage = [[
+script run hf_mf_em_util [-h] [-4] [-a <hex>] [-b <hex>] [-x <hex>] [-u <hex>]
+]]
+-- Arguments
+arguments = [[
+    -h          this help
+    -4          format as 4K card
+    -a <hex>    define key A
+    -b <hex>    define key B
+    -x <hex>    define Access Bytes
+    -u <hex>    define User Byte
+]]
+-- Help function
+local function help()
+    print(copyright)
+    print(author)
+    print(version)
+    print(desc)
+    print(ansicolors.cyan..'Usage'..ansicolors.reset)
+    print(usage)
+    print(ansicolors.cyan..'Arguments'..ansicolors.reset)
+    print(arguments)
+    print(ansicolors.cyan..'Example usage'..ansicolors.reset)
+    print(example)
+end
+-- Print error
+local function oops(err)
+    print('ERROR:', err)
+    return nil,err
+end
+
+-- Memory formatting
+local function card_format(key_a,key_b,ab,user,s70)
+    local blocks = {3,7,11,15,19,23,27,31,35,39,43,47,51,55,59,63,67,71,75,79,83,87,91,95,99,103,107,111,115,119,123,127,143,159,175,191,207,223,239,255}
+    for k,v in ipairs(blocks) do
+        local cmd = string.format("hf mf esetblk --blk %s -d %s%s%s%s",v,key_a,ab,user,key_b)
+        core.console(cmd)
+        print(cmd)
+        core.clearCommandBuffer()
+	if s70 == false and k > 15 then
+		return
+        end
+    end
+end
+
+local function main(args)
+    -- Receive parameters
+    for o, a in getopt.getopt(args, 'ha:b:x:u:4') do
+        if o == 'h' then return help() end
+        if o == 'a' then KeyA = a end
+        if o == 'b' then KeyB = a end
+        if o == 'x' then Accessbit = a end
+        if o == 'u' then User = a end
+        if o == '4' then kkkk = true end
+    end
+
+    local KeyA = KeyA or 'FFFFFFFFFFFF'
+    if #(KeyA) ~= 12 then
+            return oops( string.format('Wrong length of the Key A, receveid %d, expected 12', #KeyA))
+    end
+
+    local KeyB = KeyB or 'FFFFFFFFFFFF'
+    if #(KeyB) ~= 12 then
+            return oops( string.format('Wrong length of the Key B, received %d, expected 12', #KeyB))
+    end
+
+    local Accessbit = Accessbit or 'FF0780'
+    if #(Accessbit) ~= 6 then
+            return oops( string.format('Wrong length of the Access bit, received %d, expected 6', #Accessbit))
+    end
+
+    local User = User or '00'
+    if #(User) ~= 2 then
+            return oops( string.format('Wrong lenght for the user defined byte, received %d, expected 2', #User))
+    end
+
+    local kkkk = kkkk or false
+
+    -- Call card_format function
+    card_format(KeyA,KeyB,Accessbit,User,kkkk)
+end
+main (args)