diff --git a/.gitignore b/.gitignore
index 100a88a..7e84af6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea
 cmake-build-debug
 CMakeLists.txt
+.build
\ No newline at end of file
diff --git a/README.md b/README.md
index 070dacb..d8e8e8b 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,12 @@
 Some stuff about GPON Stick DFP-34X-2C2 / DFP-34G-2C2
 
 ## Set hexadecimal GPON password
+(There is a pre-built binary available in releases)
 
 - Set up a cross-compilation environment with [crosstool-ng](https://crosstool-ng.github.io/docs/)
   - Use the `ct-ng.config` in the repo, or config it as `arm-unknown-linux-uclibcgnueabi` in the samples, with CPU set to `arm9tdmi`
-- Compile libtagparamuserapi.so with command like `arm-unknown-linux-uclibcgnueabi-gcc -shared -o libtagparamuserapi.so libtagparamuserapi.c`
+- Compile the dummy libtagparamuserapi.so with command like `arm-unknown-linux-uclibcgnueabi-gcc -shared -o libtagparamuserapi.so libtagparamuserapi.c`
 - Compile the program with command like `arm-unknown-linux-uclibcgnueabi-gcc -std=c99 libtagparamuserapi.so -s -o setmac_hex setmac_hex.c`
-- Send compiled executable to the stick through telnet using the python script `telnet_send.py`
-- Telnet to the stick and run command like `/var/tmp/setmac_hex 1 2178 "f2 01 80 01 02 03 04 00 00 00"` (replace the hex string in quotes) to set GPON password
+- Set up a TFTP server in the same subnet, and get the executable on stick with commands like `cd /var/tmp && tftp -g setmac_hex -p 192.168.1.2 69`
+- Telnet to stick and run command like `/var/tmp/setmac_hex 1 2178 "f2 01 80 01 02 03 04 00 00 00"` to set GPON password
 - Run `setmac 2 2178` or `/var/tmp/setmac_hex 2 2178` to verify the result
diff --git a/telnet_send.py b/telnet_send.py
deleted file mode 100644
index 5851f2c..0000000
--- a/telnet_send.py
+++ /dev/null
@@ -1,28 +0,0 @@
-import telnetlib
-from time import sleep
-
-exe = r'setmac_hex'  # file path
-host = '192.168.1.1'
-user = 'root'
-password = 'Pon521'
-
-tn = telnetlib.Telnet(host)
-
-tn.read_until(b'Login: ')
-tn.write(user.encode('ascii') + b'\n')
-if password:
-    tn.read_until(b'Password: ')
-    tn.write(password.encode('ascii') + b'\n')
-tn.write(b'> /var/tmp/setmac_hex\n')
-tn.write(b'chmod +x /var/tmp/setmac_hex\n')
-
-with open(exe, 'rb') as f:
-    while (_bytes := f.read(20)):  # seems writing 20 bytes each time could be most stable
-        data = ''
-        for byte in _bytes:
-            data += '\\x' + bytes([byte]).hex()
-        tn.write(b'echo -ne "' + data.encode('ascii') + b'" >> /var/tmp/setmac_hex\n')
-        sleep(0.1)
-
-tn.write(b'exit\n')
-print(tn.read_all().decode('ascii'))