My R36S won't boot / shows a black screen. What should I do?

Replace the SD card immediately - stock cards are unreliable. Use the Panel Picker tool to fix display issues by selecting the correct DTB file for your screen type.

What SD card should I use for R36S?

Use a high-quality microSD card from SanDisk or Samsung with at least 32GB capacity. Replace the stock SD card immediately to avoid crashes and data loss.

How do I fix audio crackling on R36S?

Reduce audio latency in RetroArch settings from 64ms to 32ms or lower. This typically resolves crackling issues on most systems.

How can I improve battery life on my R36S?

Reduce screen brightness to 50-70%, use efficient emulator cores (like QuickNES for NES), and remove Wi-Fi dongles when not in use. This can extend battery life by 40-60%.

Troubleshooting & How-To Guides

Quick answers to the most common R36S questions and problems. For detailed tutorials, see our Articles section.

🖥️ Boot Issues ⚡ Performance 🔊 Audio 🔋 Battery ❓ Quick Answers

🖥️ Boot & Display Issues

⚠️ Black screen at boot?

This usually means a mismatch between your screen panel and the .dtb (device-tree) file.

Quick fixes:

Wait 10 minutes on first boot (firmware is expanding)
Use Panel Picker Mode in community ArkOS builds
Try different .dtb files: panel4.dtb, panel5.dtb

→ Full boot troubleshooting guide

⚠️ Won't boot or save games?

Most common cause: Faulty stock SD card

The cheap micro-SD cards included with R36S fail frequently, causing boot failures, missing games, and corrupted saves.

Solution:

Replace with a branded card (Samsung, SanDisk, Kingston)
Re-flash your firmware to the new card
Test with H2testw before use

→ SD card replacement guide

❓ "Booting fail! Check kernel and dtb images!" error?

This indicates corrupted SD card or missing .dtb file.

Solutions: Reflash firmware, verify .dtb file in BOOT partition, try different SD card.

→ Detailed boot error fixes

⚡ Performance Issues

❓ PS1 games lagging with enhanced resolution?

Enhanced resolution is demanding on the RK3326 chip.

Quick fixes:

Disable enhanced resolution in emulator settings
Use native PlayStation resolution (320×240)
Switch to PCSX ReARMed (faster than DuckStation)

→ Complete PS1 optimization guide

✅ Input lag in N64 or PS1 games?

Enable Run-Ahead in RetroArch:

Settings → Latency → Enable "Run-Ahead"
Set Run-Ahead frames to 1 or 2
Reduce audio latency in Settings → Audio

→ Advanced RetroArch configuration

✅ How to save video/shader settings per core?

In RetroArch Quick Menu (FN + X):

Adjust your settings (scaling, shaders, etc.)
Quick Menu → Overrides → Save Core Overrides

This applies settings to all games using that core.

→ RetroArch settings guide

🔊 Audio Issues

⚠️ Audio crackling with Wi-Fi or Dreamcast?

This is a known hardware issue caused by power supply interference.

Mitigation strategies:

Use headphones (less affected than speaker)
Reduce Wi-Fi usage during gameplay
For Dreamcast: adjust audio settings in Flycast menu

→ Complete audio troubleshooting guide

🔋 Battery & Power

❓ How long does the battery last?

Battery life varies by workload:

8/16-bit systems: 7–8 hours
PlayStation 1: 6–7 hours
Dreamcast, PSP, N64: 5–6 hours

Charging: Use 5V/1–2A USB-A to USB-C cable. Full charge takes ~4 hours.

✅ How to optimize battery life?

Power-saving tips:

Lower screen brightness to 50–70%
Turn off Wi-Fi when not needed
Use efficient emulator cores (Snes9x 2005)
Exit games properly, don't overuse sleep mode

❓ Battery indicator jumping rapidly?

This is a known software issue with ArkOS battery reporting.

Solutions: Run a few full charge/discharge cycles to calibrate, or update to latest firmware.

❓ Quick Answers

❓ How to exit a game safely?

Never use the power button! This corrupts saves.

Proper exit methods:

ArkOS stock: Start + Select
Community ArkOS/Rocknix: FN + Start

→ Full getting started guide

❓ How to save and load states?

Default hotkeys:

Save state: FN + R1
Load state: FN + L1
Change slot: FN + D-pad Up/Down

❓ Is there HDMI output?

No. The R36S does not include HDMI or any video output capability.

❓ What is the FN button for?

FN acts as a hotkey modifier:

FN + R1/L1: Save/Load state
FN + R2: Fast-forward
FN + X: RetroArch Quick Menu
FN + Start: Exit game