Mobile Recorder device list loading but not active, even with USB debugging.

Mobile Testing
1

“Hi, I’m trying to use the Mobile Recorder with my realme P1 5G device and my laptop running Katalon Studio version 11.0.1. The phone is correctly connected via USB, and I have enabled USB debugging with file transfer mode. However, the ‘Select Device’ dropdown keeps showing ‘Loading’ and the ‘Start Record’ button is not active. I have tried restarting Katalon Studio, replugging the USB, using different ports, and toggling USB debugging. There are no software updates available for my phone. Can anyone suggest a solution?”

2

Hi there, and thanks for posting in the Katalon community! :hugs:

To help you faster, please review our guide on Record Mobile Utility here:

Double-checking the steps and configurations might resolve the issue.

If the doc doesn’t help, feel free to provide more details, and a community member will assist you soon.

Thanks for being a part of our community!
Best,
Elly Tran

3

hi @azmat

first, verify ADB actually sees your device. Open a terminal and run adb devices
if your device serial number does not appear, Katalon will never populate that dropdown

Realme devices often require an additional toggle beyond standard USB debugging
in Developer Options, look for “USB debugging (Security Settings)” and enable that as well. It is a separate option further down the list and requires a PIN confirmation. Without it, ADB connects but cannot execute commands, which causes the perpetual loading state

if adb devices shows “unauthorized” next to your serial, check your phone for the RSA fingerprint prompt and accept it

if it shows nothing at all, try restarting the ADB server with adb kill-server followed by adb start-server

4

Mobile Recorder “Loading” + inactive Start = ADB not detecting device fully (Realme P1 common).

Fix Steps

  1. Terminal: adb devices
  • Empty/unauthorized? → Fix auth.
  1. Phone Developer Options (Realme/MIUI):
  • :white_check_mark: USB Debugging
  • :white_check_mark: USB Debugging (Security Settings) ← Key for Realme!
  • :white_check_mark: Install via USB
  • Revoke USB authorizations → Reconnect → Accept RSA prompt.
  1. ADB Reset:

text

adb kill-server
adb start-server
adb devices  // Should show serial (no unauthorized)
  1. KS11: Refresh device list post-fix.

Verify: adb shell getprop ro.product.model → "Realme P1 5G