diff --git a/Cargo.toml b/Cargo.toml
index b7deab3..91ad89f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,3 +30,4 @@ indicatif = "0.17"
 tokio = { version = "1.34", features = ["full"] }
 truncatable = "0.1"
 anyhow = "1.0"
+base64 = "0.22.1"
diff --git a/src/mihoro.rs b/src/mihoro.rs
index 64522f2..5a33593 100644
--- a/src/mihoro.rs
+++ b/src/mihoro.rs
@@ -2,7 +2,9 @@ use crate::cmd::ProxyCommands;
 use crate::config::{apply_mihomo_override, parse_config, Config};
 use crate::proxy::{proxy_export_cmd, proxy_unset_cmd};
 use crate::systemctl::Systemctl;
-use crate::utils::{create_parent_dir, delete_file, download_file, extract_gzip};
+use crate::utils::{
+    create_parent_dir, delete_file, download_file, extract_gzip, try_decode_base64_file_inplace,
+};
 
 use std::fs;
 use std::os::unix::prelude::PermissionsExt;
@@ -83,6 +85,10 @@ impl Mihoro {
             &self.mihomo_target_config_path,
         )
         .await?;
+
+        // Try to decode base64 file in place if file is base64 encoding, otherwise do nothing
+        try_decode_base64_file_inplace(&self.mihomo_target_config_path)?;
+
         apply_mihomo_override(&self.mihomo_target_config_path, &self.config.mihomo_config)?;
 
         // Download geodata
@@ -109,6 +115,10 @@ impl Mihoro {
             &self.mihomo_target_config_path,
         )
         .await?;
+
+        // Try to decode base64 file in place if file is base64 encoding, otherwise do nothing
+        try_decode_base64_file_inplace(&self.mihomo_target_config_path)?;
+
         apply_mihomo_override(&self.mihomo_target_config_path, &self.config.mihomo_config)?;
         println!(
             "{} Updated and applied config overrides",
diff --git a/src/utils.rs b/src/utils.rs
index 4e778a6..e441c0b 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,11 +1,12 @@
 use std::{
     cmp::min,
     fs::{self, File},
-    io::{self, Write},
+    io::{self, BufWriter, Read, Seek, SeekFrom, Write},
     path::Path,
 };
 
 use anyhow::{Context, Result};
+use base64::{prelude::BASE64_STANDARD, Engine};
 use colored::Colorize;
 use flate2::read::GzDecoder;
 use futures_util::StreamExt;
@@ -126,3 +127,39 @@ pub fn extract_gzip(gzip_path: &str, filename: &str, prefix: &str) -> Result<()>
     );
     Ok(())
 }
+
+/// Try and decode a base64 encoded file in place.
+///
+/// Decodes the base64 encoded content of a file in place and writes the decoded content back to the
+/// file. If the file does not contain base64 encoded content, maintains the file as is.
+///
+/// # Arguments
+///
+/// * `filepath` - Path to the file to decode base64 content in place.
+pub fn try_decode_base64_file_inplace(filepath: &str) -> Result<()> {
+    // Open the file for reading and writing
+    let mut file = File::options().read(true).write(true).open(filepath)?;
+    let mut base64_buf = Vec::new();
+
+    // Read the file content into the buffer
+    file.read_to_end(&mut base64_buf)?;
+
+    // Try to decode the base64 content
+    match BASE64_STANDARD.decode(&base64_buf) {
+        Ok(decoded_bytes) => {
+            // Truncate the file and seek to the beginning
+            file.set_len(0)?;
+            file.seek(SeekFrom::Start(0))?;
+
+            // Write the decoded bytes back to the file
+            let mut writer = BufWriter::new(&file);
+            writer.write_all(&decoded_bytes)?;
+        }
+        Err(_) => {
+            // If decoding fails, do nothing and return Ok
+            return Ok(());
+        }
+    }
+
+    Ok(())
+}