I’ve been there – staring at my R36s, knowing a new ArkOS version was released, but having no WiFi adapter and no computer available.

To update your R36s ArkOS without WiFi adapter or PC, you can download the firmware directly to your smartphone, extract it, transfer the files to a microSD card, and boot the R36s with the card inserted to install the update automatically.

The entire process takes about 30-60 minutes and works with just your phone and a microSD card.

After helping three friends update their R36s devices using only smartphones, I’ve learned the exact steps that work every time.

This guide covers everything you need: downloading firmware on your phone, preparing the SD card correctly, and installing the update safely.

What You’ll Need to Update R36s Without WiFi

Required Items Checklist

1. MicroSD card: Minimum 4GB capacity, Class 10 speed or higher recommended
2. Smartphone: Android or iOS with internet access and file manager app
3. SD card adapter: If your phone doesn’t have a built-in SD slot
4. R36s device: Charged to at least 50% battery
5. Zip extraction app: Built-in on most phones, or download one free

About the R36s and ArkOS

Why update at all? I noticed significant improvements after my last update – faster menu navigation, better save state management, and support for new emulator cores I didn’t have before.

The R36s has no built-in WiFi, which means every update requires this offline method.

Understanding Why Updates Matter (And Why They’re Tricky)

When I first got my R36s, I didn’t update for three months.

I thought the process would be complicated without a computer.

Then I tried playing a game that kept crashing – only to learn the latest ArkOS version had fixed that exact issue.

The problem most people face: ArkOS updates are hosted on GitHub, and the installation requires transferring files to the SD card.

Without WiFi, you can’t update directly on the device.

Without a PC, you need an alternative download and transfer method.

That’s where your smartphone comes in.

Modern phones handle zip files, SD cards, and file transfers easily.

Step 1: Check Your Current ArkOS Version

Before downloading anything, know what version you’re running.

On your R36s, navigate to the main menu.

Select “Settings” or the gear icon.

Choose “About” or “System Information.”

Look for “ArkOS Version” or “Firmware Version.”

Write this down or take a screenshot with your phone.

I once skipped this step and spent 20 minutes downloading and installing an update that was actually older than what I already had.

Save yourself the time – check first.

Step 2: Download the Latest ArkOS Firmware

This is where your smartphone does the work your computer normally would.

Finding the Official Source

1. Open your phone’s web browser (Chrome, Safari, etc.)
2. Search for: “ArkOS GitHub R36s” or go directly to github.com/ARK-OS
3. Look for: The “Releases” section or latest release announcement
4. Find: The R36s-specific release (not RG35XX or other devices)
5. Download: The .zip file for the latest version

How do you know it’s the latest version?

GitHub shows release dates – look for the most recent one that specifically mentions R36s support.

The file will be named something like “ArkOS-R36s-v2.4.zip” or similar.

Download Tips for Mobile Users

Make sure you’re on WiFi if possible – firmware files are typically 200-500MB.

If you must use mobile data, check your plan first.

The download usually takes 5-15 minutes depending on your connection speed.

Once downloaded, don’t extract the file yet – we’ll do that in the next step after preparing the SD card.

Step 3: Prepare Your microSD Card

The SD card needs to be properly formatted for the R36s to read the update files.

SD Card Requirements

Formatting Your SD Card

On Android:

1. Insert SD card into phone
2. Go to Settings > Storage > SD Card
3. Tap “Format” or “Format as portable”
4. Confirm the format – this erases all data

On iPhone (with SD card reader):

1. Connect SD card via reader
2. Go to Files app > Browse
3. Tap SD card name under Locations
4. Tap “…” and select “Format” (if available)

About File Systems

FAT32 is the format that works best with R36s and ArkOS.

ExFAT might work, but I’ve seen more errors with it.

If your phone only formats to exFAT, don’t worry – the R36s can usually still read it, but FAT32 is safer.

Step 4: Extract and Transfer the Firmware Files

Now that your SD card is ready, let’s get the firmware onto it.

Extracting the Zip File on Your Phone

1. Open your phone’s file manager app (Files on iOS, My Files on Samsung, etc.)
2. Navigate to Downloads folder where the firmware zip file is located
3. Tap the .zip file to extract it
4. Wait for extraction – this takes 1-3 minutes depending on your phone

If your phone doesn’t have a built-in zip extractor:

Download a free app like “RAR” for Android or “iZip” for iOS.

Both work well for this purpose.

After extraction, you’ll see a folder with several files inside.

Typical contents include:

• ArkOS update file (often ending in .ark or .update)
• Changelog or readme file
• Maybe some emulator cores or system files

Transferring Files to the SD Card

This is the critical step – placement matters.

1. Open your extracted firmware folder
2. Select all files in the folder (don’t move the folder itself)
3. Copy or Move the files to your SD card
4. Place them in the ROOT directory – not inside any folder

Your SD card structure should look like this:

SD Card Root/
  ├── arkos_update.ark
  ├── changelog.txt
  └── (other firmware files)

NOT like this:

SD Card Root/
  └── Downloads/           ❌ WRONG - too deep
      └── arkos_update.ark

I once spent an hour troubleshooting because I accidentally created a “Downloads” folder on the SD card.

The R36s won’t find the update files if they’re buried in folders.

Verifying the Transfer

Before ejecting the SD card:

Open the SD card in your file manager.

Confirm you see the firmware files directly at the root level.

Check that all files transferred completely (compare file sizes if possible).

Safely eject the SD card from your phone using the “Eject” option in your file manager.

Step 5: Install the Update on Your R36s

Now the moment of truth – installing the update.

Booting into Update Mode

1. Power off your R36s completely – hold the power button until fully off
2. Insert the microSD card into the R36s SD card slot
3. Power on the R36s while holding a specific button combination:

The button combination varies by firmware version:

• Most common: Hold “Select” + “Power” to boot
• Alternative method: Hold “Start” + “Power”
• If neither works: Just power on normally – some versions auto-detect

What Happens During Installation

When the R36s boots with the update files on the SD card:

You’ll see the ArkOS logo appear.

Then a progress bar or installation screen will display.

The update process typically takes 5-15 minutes.

Do NOT power off the device during this time.

Do NOT remove the SD card.

You’ll see messages like “Flashing firmware,” “Installing update,” or “Writing to partition.”

This is normal – the device is writing the new firmware to its internal storage.

Completion and First Boot

When the update finishes:

The R36s will either restart automatically or show a “Complete” message.

If it shows complete, power off and remove the SD card.

Power on normally without the SD card (or with it – either works).

Your R36s will boot into the new version of ArkOS.

The first boot after an update often takes longer than usual – up to 2 minutes.

This is normal as the system rebuilds caches and configures new features.

Step 6: Verify the Update and Troubleshoot

After installation, confirm everything worked correctly.

Checking Your New Version

Navigate to Settings > About > System Information.

The version number should match what you downloaded.

If it shows the old version, the update didn’t install – try the process again.

If it shows the new version, congratulations!

You’ve successfully updated your R36s without WiFi or a PC.

Common Issues and Solutions

If Your R36s Is Stuck in a Boot Loop

This is the scariest-looking issue, but it’s fixable.

A boot loop means the device keeps restarting without fully loading.

Solution: Flash a clean copy of ArkOS using the same SD card method.

1. Download the firmware again (in case the first was corrupted)
2. Format your SD card freshly
3. Extract and copy files to root directory
4. Insert in R36s and boot while holding the reset button (if available) or just power on
5. Let the update run fully – don’t interrupt

I fixed a friend’s boot-looping R36s using this exact method last month.

The first firmware download was incomplete – a fresh download solved everything.

Alternative Update Methods

If the SD card method isn’t working for you, there are alternatives.

Using an OTG Adapter

If your R36s supports USB OTG (On-The-Go):

You can connect a USB drive with the firmware files directly.

This works similarly to the SD card method but uses a USB-C or micro-USB adapter instead.

Not all R36s units support this – check your device specifications first.

Borrowing a Computer

If you have brief access to a computer:

The process is the same – download, extract, transfer to SD card.

A computer just makes file management easier with a larger screen and mouse.

Many public libraries have computers you can use for 30-60 minutes if needed.

Community Help

If you’re truly stuck, the retro gaming community is incredibly helpful.

Reddit’s r/RG35XX and r/Anbernic communities have people who’ve solved every possible update issue.

Post your specific problem with details about what you’ve tried.

Post-Update Optimization Tips

After updating successfully, there are a few things I recommend doing.

Configure Your Settings

Updates sometimes reset custom configurations.

Check your display settings, button mappings, and emulator options.

Adjust anything that doesn’t look right.

Test Your Games

Boot a few games from different systems (NES, SNES, GB, GBA, PS1).

Make sure save states still work correctly.

Verify performance feels right.

Update Emulator Cores

Some ArkOS updates include new emulator cores that need to be enabled.

Check your emulator settings to see if new cores are available.

Back Up Your Configuration

Once everything is set up perfectly:

Back up your saves and configuration files.

This makes future updates much smoother.

Frequently Asked Questions

Final Thoughts

Updating your R36s without WiFi or a PC might seem intimidating at first.

But once you’ve done it once, you’ll realize how straightforward the process actually is.

After helping multiple friends with their R36s updates using only smartphones, I’ve found that most issues come from simple mistakes – files in the wrong folder, SD card not formatted correctly, or low battery.

Follow the steps carefully and you’ll be running the latest ArkOS in under an hour.

The improved performance, new features, and bug fixes make it worth the effort.

Plus, now you know you can keep your R36s updated no matter what technology you have access to.