diff --git a/solo/start/rsa.py b/solo/start/rsa.py
index accb9841..81699424 100644
--- a/solo/start/rsa.py
+++ b/solo/start/rsa.py
@@ -39,6 +39,19 @@ def read_key_from_file(file):
         raise ValueError("wrong key", p, q, n)
     return (unhexlify(n_str), unhexlify(e_str), unhexlify(p_str), unhexlify(q_str), e, p, q, n)
 
+def read_key_from_list(data):
+    n_str, e_str, p_str, q_str = data
+    e = int(e_str, 16)
+    p = int(p_str, 16)
+    q = int(q_str, 16)
+    n = int(n_str, 16)
+    if n != p * q:
+        raise ValueError("wrong key", p, q, n)
+    return (unhexlify(n_str), unhexlify(e_str), unhexlify(p_str), unhexlify(q_str), e, p, q, n)
+
+
+
+
 # egcd and modinv are from wikibooks
 # https://en.wikibooks.org/wiki/Algorithm_Implementation/Mathematics/Extended_Euclidean_algorithm
 
diff --git a/solo/start/rsa_example.key b/solo/start/rsa_example.key
deleted file mode 100644
index cdf2d5ec..00000000
--- a/solo/start/rsa_example.key
+++ /dev/null
@@ -1,4 +0,0 @@
-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
-010001
-b5ab7b159220b18e363258f61ebde08bae83d6ce2dbfe4adc143628c527887acde9de09bf9b49f438019004d71855f30c2d69b6c29bb9882ab641b3387409fe9199464a7faa4b5230c56d9e17cd9ed074bc00180ebed62bae3af28e6ff2ac2654ad968834c5d5c88f8d9d3cc5e167b10453b049d4e454a5761fb0ac717185907
-dd2fffa9814296156a6926cd17b65564187e424dcadce9b032246ad7e46448bb0f9e0ff3c64f987424b1a40bc694e2e9ac4fb1930d163582d7acf20653a1c44b97846c1c5fd8a7b19bb225fb39c30e25410483deaf8c2538d222b748c4d8103b11cec04f666a5c0dbcbf5d5f625f158f65746c3fafe6418145f7cffa5fadeeaf
diff --git a/solo/start/rsa_pub_key.py b/solo/start/rsa_pub_key.py
new file mode 100644
index 00000000..f216ba3d
--- /dev/null
+++ b/solo/start/rsa_pub_key.py
@@ -0,0 +1,7 @@
+rsa_key_data = [
+    "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",
+    "010001",
+    "b5ab7b159220b18e363258f61ebde08bae83d6ce2dbfe4adc143628c527887acde9de09bf9b49f438019004d71855f30c2d69b6c29bb9882ab641b3387409fe9199464a7faa4b5230c56d9e17cd9ed074bc00180ebed62bae3af28e6ff2ac2654ad968834c5d5c88f8d9d3cc5e167b10453b049d4e454a5761fb0ac717185907",
+    "dd2fffa9814296156a6926cd17b65564187e424dcadce9b032246ad7e46448bb0f9e0ff3c64f987424b1a40bc694e2e9ac4fb1930d163582d7acf20653a1c44b97846c1c5fd8a7b19bb225fb39c30e25410483deaf8c2538d222b748c4d8103b11cec04f666a5c0dbcbf5d5f625f158f65746c3fafe6418145f7cffa5fadeeaf"
+]
+
diff --git a/solo/start/upgrade_by_passwd.py b/solo/start/upgrade_by_passwd.py
index f8ef269f..27296258 100755
--- a/solo/start/upgrade_by_passwd.py
+++ b/solo/start/upgrade_by_passwd.py
@@ -65,6 +65,8 @@
 from solo.start.kdf_calc import kdf_calc
 from solo.start.threaded_log import ThreadLog
 from solo.start.usb_strings import get_devices, print_device
+from solo.start.rsa_pub_key import rsa_key_data
+
 
 LOG_FORMAT_STDOUT = '*** %(asctime)-15s %(levelname)6s %(name)10s %(message)s'
 LOG_FORMAT = '%(relativeCreated)-8d %(levelname)6s %(name)10s %(message)s'
@@ -130,7 +132,7 @@ def main(wait_e, keyno, passwd, data_regnual, data_upgrade, skip_bootloader, ver
             local_print("CRC32: %04x\n" % crc32code)
         data_regnual += pack('<I', crc32code)
 
-        rsa_key = rsa.read_key_from_file('solo/start/rsa_example.key')
+        rsa_key = rsa.read_key_from_list(rsa_key_data)
         rsa_raw_pubkey = rsa.get_raw_pubkey(rsa_key)
 
         gnuk = get_gnuk_device(logger=logger)