diff --git a/radio.c b/radio.c
index 104bb31..a818318 100644
--- a/radio.c
+++ b/radio.c
@@ -58,11 +58,11 @@ static struct {
     { 0, 0 }
 };
 
+static radio_device_t *device;          // Device-dependent interface
+
 unsigned char radio_mem [1024*1024*2];  // Radio memory contents, up to 2 Mbytes
 int radio_progress;                     // Read/write progress counter
 
-static radio_device_t *device;          // Device-dependent interface
-
 //
 // Close the serial port.
 //
@@ -92,6 +92,7 @@ radio_device_t* radio_connect()
 {
     const char *ident;
     int i;
+    radio_device_t * dev = 0;
 
     // Try TYT MD family.
     ident = dfu_init(0x0483, 0xdf11);
@@ -113,16 +114,18 @@ radio_device_t* radio_connect()
 
     for (i=0; radio_tab[i].ident; i++) {
         if (strcasecmp(ident, radio_tab[i].ident) == 0) {
-            device = radio_tab[i].device;
+            dev = radio_tab[i].device;
             break;
         }
     }
-    if (! device) {
+    if (! dev) {
         fprintf(stderr, "Unrecognized radio '%s'.\n", ident);
         exit(-1);
     }
-    fprintf(stderr, "Connect to %s.\n", device->name);
-    return device;
+    fprintf(stderr, "Connect to %s.\n", dev->name);
+
+    device = dev;
+    return dev;
 }
 
 //
@@ -179,11 +182,12 @@ void radio_upload(radio_device_t* dev, int cont_flag)
 //
 // Read firmware image from the binary file.
 //
-void radio_read_image(const char *filename)
+radio_device_t* radio_read_image(const char *filename)
 {
     FILE *img;
     struct stat st;
     char ident[8];
+    radio_device_t * dev = NULL;
 
     fprintf(stderr, "Read codeplug from file '%s'.\n", filename);
     img = fopen(filename, "rb");
@@ -200,11 +204,11 @@ void radio_read_image(const char *filename)
     switch (st.st_size) {
     case 851968:
     case 852533:
-        device = &radio_uv380;
+        dev = &radio_uv380;
         break;
     case 262144:
     case 262709:
-        device = &radio_md380;
+        dev = &radio_md380;
         break;
     case 1606528:
         if (fread(ident, 1, 8, img) != 8) {
@@ -213,11 +217,11 @@ void radio_read_image(const char *filename)
         }
         fseek(img, 0, SEEK_SET);
         if (memcmp(ident, "D868UVE", 7) == 0) {
-            device = &radio_d868uv;
+            dev = &radio_d868uv;
         } else if (memcmp(ident, "D878UV", 6) == 0) {
-            device = &radio_d878uv;
+            dev = &radio_d878uv;
         } else if (memcmp(ident, "D6X2UV", 6) == 0) {
-            device = &radio_dmr6x2;
+            dev = &radio_dmr6x2;
         } else {
             fprintf(stderr, "%s: Unrecognized header '%.6s'\n",
                 filename, ident);
@@ -230,11 +234,11 @@ void radio_read_image(const char *filename)
             exit(-1);
         }
         if (memcmp(ident, "BF-5R", 5) == 0) {
-            device = &radio_rd5r;
+            dev = &radio_rd5r;
         } else if (memcmp(ident, "MD-760P", 7) == 0) {
-            device = &radio_gd77;
+            dev = &radio_gd77;
         } else if (memcmp(ident, "1801", 4) == 0) {
-            device = &radio_dm1801;
+            dev = &radio_dm1801;
         } else if (memcmp(ident, "MD-760", 6) == 0) {
             fprintf(stderr, "Old Radioddity GD-77 v2.6 image not supported!\n");
             exit(-1);
@@ -251,14 +255,18 @@ void radio_read_image(const char *filename)
         exit(-1);
     }
 
-    device->read_image(device, img);
+
+    dev->read_image(dev, img);
     fclose(img);
+
+    device = dev;
+    return dev;
 }
 
 //
 // Save firmware image to the binary file.
 //
-void radio_save_image(const char *filename)
+void radio_save_image(radio_device_t* device, const char *filename)
 {
     FILE *img;
 
@@ -275,7 +283,7 @@ void radio_save_image(const char *filename)
 //
 // Read the configuration from text file, and modify the firmware.
 //
-void radio_parse_config(const char *filename)
+void radio_parse_config(radio_device_t* device, const char *filename)
 {
     FILE *conf;
     char line [256], *p, *v;
@@ -358,7 +366,7 @@ badline:            fprintf(stderr, "Invalid line: '%s'\n", line);
 //
 // Print full information about the device configuration.
 //
-void radio_print_config(FILE *out, int verbose)
+void radio_print_config(radio_device_t* device, FILE *out, int verbose)
 {
     if (verbose) {
         char buf [40];
@@ -380,7 +388,7 @@ void radio_print_config(FILE *out, int verbose)
 //
 // Check the configuration is correct.
 //
-void radio_verify_config()
+void radio_verify_config(radio_device_t* device)
 {
     if (!device->verify_config(device)) {
         // Message should be already printed.
@@ -391,7 +399,7 @@ void radio_verify_config()
 //
 // Update contacts database on the device.
 //
-void radio_write_csv(const char *filename)
+void radio_write_csv(radio_device_t* device, const char *filename)
 {
     FILE *csv;
 
diff --git a/src/lib.rs b/src/lib.rs
index e70d089..8f5a348 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -109,17 +109,17 @@ pub extern "C" fn rust_main(_argc: c_int, _argv: *const *const c_char) -> c_int
       let device = radio::connect(); //NOTE this changes the semantics of the program
       radio::read_image(&img);
       radio::print_version(device);
-      radio::parse_config(&config_filename);
-      radio::verify_config();
-      radio::save_image("device.img");
+      radio::parse_config(device, &config_filename);
+      radio::verify_config(device);
+      radio::save_image(device, "device.img");
     } else {
       // Update device from text config file.
         let device = radio::connect();
         radio::download(device);
         radio::print_version(device);
-        radio::save_image("device.img");
-        radio::parse_config(&config_filename);
-        radio::verify_config();
+        radio::save_image(device, "device.img");
+        radio::parse_config(device, &config_filename);
+        radio::verify_config(device);
         radio::upload(device, 1);
         radio::disconnect();
     }
@@ -128,9 +128,9 @@ pub extern "C" fn rust_main(_argc: c_int, _argv: *const *const c_char) -> c_int
       print_usage();
     }
     // Verify text config file.
-    radio::connect();
-    radio::parse_config(&matches.free[0]);
-    radio::verify_config();
+    let device = radio::connect();
+    radio::parse_config(device, &matches.free[0]);
+    radio::verify_config(device);
     radio::disconnect();
   } else if read_flag {
     if matches.free.len() != 0 {
@@ -142,28 +142,28 @@ pub extern "C" fn rust_main(_argc: c_int, _argv: *const *const c_char) -> c_int
       radio::download(device);
       radio::print_version(device);
       radio::disconnect();
-      radio::save_image("device.img");
+      radio::save_image(device, "device.img");
 
     // Print configuration to file.
     let filename = "device.conf";
     println!("Print configuration to file '{}.", filename);
 
-    radio::print_config(filename);
+    radio::print_config(device, filename);
 
   } else if csv_flag {
     if matches.free.len() != 1 {
       print_usage();
     }
 
-    radio::connect();
-    radio::write_csv(&matches.free[0]);
+    let device = radio::connect();
+    radio::write_csv(device, &matches.free[0]);
     radio::disconnect();
   } else {
     if matches.free.len() != 1 {
       print_usage();
     }
-    radio::read_image(&matches.free[0]);
-    radio::print_config_to_stdout();
+    let device = radio::read_image(&matches.free[0]);
+    radio::print_config_to_stdout(device);
   }
 
   exit(0);
diff --git a/src/radio.rs b/src/radio.rs
index fd5a240..d832b98 100644
--- a/src/radio.rs
+++ b/src/radio.rs
@@ -11,13 +11,13 @@ extern {
   fn radio_download(device: *const RadioDeviceT);
   fn radio_upload(device: *const RadioDeviceT, cont_flag: c_int);
   fn radio_list_c();
-  fn radio_verify_config();
+  fn radio_verify_config(device: *const RadioDeviceT);
   fn radio_print_version(device: *const RadioDeviceT, stdout: *const libc::FILE);
-  fn radio_print_config(file: *const libc::FILE, verbose: c_int);
-  fn radio_read_image(filename: *const c_char);
-  fn radio_save_image(filename: *const c_char);
-  fn radio_parse_config(filename: *const c_char);
-  fn radio_write_csv(filename: *const c_char);
+  fn radio_print_config(device: *const RadioDeviceT, file: *const libc::FILE, verbose: c_int);
+  fn radio_read_image(filename: *const c_char) -> *const RadioDeviceT;
+  fn radio_save_image(device: *const RadioDeviceT, filename: *const c_char);
+  fn radio_parse_config(device: *const RadioDeviceT, filename: *const c_char);
+  fn radio_write_csv(device: *const RadioDeviceT, filename: *const c_char);
 }
 
 /// Connect to the radio via the serial port.
@@ -58,49 +58,49 @@ pub fn list() {
 }
 
 /// Check the configuration.
-pub fn verify_config() {
+pub fn verify_config(device: *const RadioDeviceT) {
   unsafe {
-    radio_verify_config();
+    radio_verify_config(device);
   }
 }
 
 /// Read firmware image from the binary file.
-pub fn read_image(filename: &str) {
+pub fn read_image(filename: &str) -> *const RadioDeviceT {
   let filename = CString::new(filename.to_string()).unwrap();
   unsafe {
-    radio_read_image(filename.as_ptr());
+    radio_read_image(filename.as_ptr())
   }
 }
 
 /// Save firmware image to the binary file.
-pub fn save_image(filename: &str) {
+pub fn save_image(device: *const RadioDeviceT, filename: &str) {
   let filename = CString::new(filename.to_string()).unwrap();
   unsafe {
-    radio_save_image(filename.as_ptr())
+    radio_save_image(device, filename.as_ptr())
   }
 }
 
 /// Read the configuration from text file, and modify the firmware.
-pub fn parse_config(filename: &str) {
+pub fn parse_config(device: *const RadioDeviceT, filename: &str) {
   let filename = CString::new(filename.to_string()).unwrap();
   unsafe {
-    radio_parse_config(filename.as_ptr())
+    radio_parse_config(device, filename.as_ptr())
   }
 }
 
 /// Print full information about the device configuration.
-pub fn print_config(filename: &str) {
+pub fn print_config(device: *const RadioDeviceT, filename: &str) {
   let file = std::fs::File::create(filename).unwrap();
   let fd = file.as_raw_fd();
   let mode = CString::new("w").unwrap();
   unsafe {
     let file =libc::fdopen(fd, mode.as_ptr());
-    radio_print_config(file, 1);
+    radio_print_config(device, file, 1);
     libc::fclose(file);
   }
 }
 
-pub fn print_config_to_stdout() {
+pub fn print_config_to_stdout(device: *const RadioDeviceT) {
   let mode = CString::new("w").unwrap();
   unsafe {
     let stdout = libc::fdopen(libc::STDOUT_FILENO, mode.as_ptr());
@@ -109,7 +109,7 @@ pub fn print_config_to_stdout() {
     } else {
       1
     };
-    radio_print_config(stdout, verbosity);
+    radio_print_config(device, stdout, verbosity);
   }
 }
 
@@ -122,9 +122,9 @@ pub fn print_version(device: *const RadioDeviceT) {
 }
 
 /// Update CSV contacts database.
-pub fn write_csv(filename: &str) {
+pub fn write_csv(device: *const RadioDeviceT, filename: &str) {
   let filename = CString::new(filename.to_string()).unwrap();
   unsafe {
-    radio_write_csv(filename.as_ptr());
+    radio_write_csv(device, filename.as_ptr());
   }
 }