diff --git a/zigate/flasher.py b/zigate/flasher.py
index 74edd26c..abbdce3e 100644
--- a/zigate/flasher.py
+++ b/zigate/flasher.py
@@ -304,7 +304,7 @@ def printProgressBar (iteration, total, prefix = '', suffix = '', decimals = 1,
     percent = ("{0:." + str(decimals) + "f}").format(100 * (iteration / float(total)))
     filledLength = int(length * iteration // total)
     bar = fill * filledLength + '-' * (length - filledLength)
-    print(f'\r{prefix} |{bar}| {percent}% {suffix}', end = printEnd)
+    print('\r{0} |{1}| {2}% {3}'.format(prefix, bar, percent, suffix), end = printEnd)
     # Print New Line on Complete
     if iteration == total: 
         print()