diff --git a/encoder/firmware.php b/encoder/firmware.php
index 9cb3189..c365b17 100755
--- a/encoder/firmware.php
+++ b/encoder/firmware.php
@@ -129,32 +129,40 @@ EwIDAQAB
 -----END PUBLIC KEY-----
 ";
 
+                error_log("starting");
                 $tmpDir = sys_get_temp_dir() . '/payload_' . bin2hex(random_bytes(6));
                 $zipFile = $tmpDir . '/payload.zip';
                 $sigFile = $tmpDir . '/payload.zip.sig';
                 $extractDir = $tmpDir . '/extract';
+                error_log("setting up directory");
 
                 mkdir($tmpDir, 0700, true);
                 mkdir($extractDir, 0700, true);
+                error_log("directory created");
+                error_log($tmpDir);
 
                 download($data['link'], $zipFile);
                 download($data['signature'], $sigFile);
+                error_log("download compltete");
 
                 $publicKey = openssl_pkey_get_public($public_key);
                 if (!$publicKey) fail('Invalid public key');
 
                 $data = file_get_contents($zipFile);
                 $signature = file_get_contents($sigFile);
+                error_log("loading zip and sig");
 
                 $verified = openssl_verify($data, $signature, $publicKey, OPENSSL_ALGO_SHA256);
-                openssl_free_key($publicKey);
 
                 if ($verified !== 1) {
+                    error_log("verification failed");
                     fail('Signature verification FAILED');
                 }
+                error_log("varification complete");
 
                 $zip = new ZipArchive();
                 if ($zip->open($zipFile) !== true) {
+                error_log("zip unzip problem");
                     fail('Unable to open ZIP');
                 }
                 for ($i = 0; $i < $zip->numFiles; $i++) {