usb: Better help text on failure to mode-switch a Greaseweazle device

Refs #338
keirf · Dec 5, 2024 · 64d37e8 · 64d37e8
1 parent f0d43b7
commit 64d37e8
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/greaseweazle/tools/util.py b/src/greaseweazle/tools/util.py
@@ -416,7 +416,9 @@ def usb_reopen(usb, is_update):
             new_usb.jumperless_update = usb.jumperless_update
             new_usb.can_mode_switch = usb.can_mode_switch
             return new_usb
-    raise serial.SerialException('Could not reopen port after mode switch')
+    raise serial.SerialException('''\
+Could not find the Greaseweazle device after switching firmware mode.
+If you are connected via a USB hub, instead try connecting directly.''')
 
 
 def print_update_instructions(usb):