diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6ec6564..96c861b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -45,8 +45,8 @@ jobs:
       - name: Build busk
         run: | 
           # Backup and modify memmap_default.ld for busk build
-          cp $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_standard_link/memmap_default.ld $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_standard_link/memmap_default.ld.bak
-          sed -i 's/RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 256k/RAM(rwx) : ORIGIN = 0x20038000, LENGTH = 32k/g' $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_standard_link/memmap_default.ld
+          cp $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_crt0/rp2040/memmap_default.ld $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_crt0/rp2040/memmap_default.ld.bak
+          sed -i 's/RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 256k/RAM(rwx) : ORIGIN = 0x20038000, LENGTH = 32k/g' $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_crt0/rp2040/memmap_default.ld
           mkdir -p $GITHUB_WORKSPACE/build/busk
           cd $GITHUB_WORKSPACE/build/busk
           cmake $GITHUB_WORKSPACE/busk
@@ -54,8 +54,8 @@ jobs:
           make clean
           cd $GITHUB_WORKSPACE
           # Restore original memmap_default.ld from backup
-          rm -f $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_standard_link/memmap_default.ld
-          mv $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_standard_link/memmap_default.ld.bak $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_standard_link/memmap_default.ld
+          rm -f $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_crt0/rp2040/memmap_default.ld
+          mv $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_crt0/rp2040/memmap_default.ld.bak $GITHUB_WORKSPACE/pico-sdk/src/rp2_common/pico_crt0/rp2040/memmap_default.ld
       
       - name: Build usk
         run: | 
diff --git a/board_detect.c b/board_detect.c
index 923585c..811479f 100644
--- a/board_detect.c
+++ b/board_detect.c
@@ -14,12 +14,13 @@ enum board_type {
     BOARD_XO,
     BOARD_IB,
     BOARD_PI,
-    BOARD_SQ
+    BOARD_SQ,
+    BOARD_WT
 };
 
 enum board_type cur_board = BOARD_WS;
 
-bool detect_by_pull_up(int frc_pin, int det_pin)
+bool detect_by_pull(int frc_pin, int det_pin, bool up)
 {
     bool result = false;
     if (frc_pin >= 0)
@@ -27,9 +28,9 @@ bool detect_by_pull_up(int frc_pin, int det_pin)
     gpio_init(det_pin);
     if (frc_pin >= 0)
         gpio_set_dir(frc_pin, true);
-    gpio_pull_up(det_pin);
+    gpio_set_pulls(det_pin, up, !up);
     sleep_us(15);
-    result = !gpio_get(det_pin);
+    result = gpio_get(det_pin) ^ up;
     gpio_deinit(det_pin);
     if (frc_pin >= 0)
         gpio_deinit(frc_pin);
@@ -39,27 +40,32 @@ bool detect_by_pull_up(int frc_pin, int det_pin)
 
 bool test_xiao()
 {
-    return detect_by_pull_up(1, 2);
+    return detect_by_pull(1, 2, 1);
 }
 
 bool test_itsy()
 {
-    return detect_by_pull_up(3, 2);
+    return detect_by_pull(3, 2, 1);
 }
 
 bool test_pico()
 {
-    return detect_by_pull_up(-1, 22);
+    return detect_by_pull(-1, 22, 1);
 }
 
 bool test_ws()
 {
-    return detect_by_pull_up(-1, 25);
+    return detect_by_pull(-1, 25, 1);
+}
+
+bool test_wt()
+{
+    return detect_by_pull(-1, 16, 0);
 }
 
 bool test_sqc()
 {
-    return detect_by_pull_up(-1, 17);
+    return detect_by_pull(-1, 17, 1);
 }
 
 void detect_board()
@@ -79,6 +85,8 @@ void detect_board()
         cur_board = BOARD_PI;
     } else if (test_sqc()) {
         cur_board = BOARD_SQ;
+    } else if (test_wt()) {
+        cur_board = BOARD_WT;
     } else {
         cur_board = BOARD_WS;
     }
@@ -95,7 +103,7 @@ int led_pin()
             return PIN_LED_ITSY;
         default:
             return PIN_LED_WS;
-    }; 
+    };
 }
 
 int pwr_pin()
@@ -107,7 +115,7 @@ int pwr_pin()
             return PIN_LED_PWR_ITSY;
         default:
             return 31;
-    }; 
+    };
 }
 
 int scl_pin()
@@ -123,7 +131,7 @@ int scl_pin()
             return PIN_SCL_SQC;
         default:
             return PIN_SCL_WS;
-    }; 
+    };
 }
 
 int sda_pin()
@@ -139,7 +147,7 @@ int sda_pin()
             return PIN_SDA_SQC;
         default:
             return PIN_SDA_WS;
-    }; 
+    };
 }
 
 int gli_pin()
@@ -153,10 +161,15 @@ int gli_pin()
             return PIN_GLI_PICO;
         default:
             return PIN_GLI_WS;
-    }; 
+    };
 }
 
 bool is_pico()
 {
     return cur_board == BOARD_PI;
 }
+
+bool is_tiny()
+{
+    return cur_board == BOARD_WT;
+}
diff --git a/board_detect.h b/board_detect.h
index 637a29c..1310c33 100644
--- a/board_detect.h
+++ b/board_detect.h
@@ -1,11 +1,12 @@
 #include "stdbool.h"
 
-bool detect_by_pull_up(int frc_pin, int det_pin);
+bool detect_by_pull(int frc_pin, int det_pin, bool up);
 
 void detect_board();
 int gli_pin();
 int pwr_pin();
 int led_pin();
 bool is_pico();
+bool is_tiny();
 int scl_pin();
-int sda_pin();
\ No newline at end of file
+int sda_pin();
diff --git a/config.h b/config.h
index 3fc3313..77186fc 100644
--- a/config.h
+++ b/config.h
@@ -4,7 +4,7 @@
 #define OFFSET_MAX 6950
 
 #define VER_HI 2
-#define VER_LO 77
+#define VER_LO 78
 
 bool is_configured();
 void init_config();
diff --git a/main.c b/main.c
index 9813277..ea06642 100644
--- a/main.c
+++ b/main.c
@@ -94,13 +94,20 @@ int main()
     init_fuses();
     // LED & glitch & emmc PIO
     upload_pio();
+    if (is_tiny())
+    {
+        gpio_put(led_pin(), 0);
+        sleep_us(100);
+        put_pixel(0);
+        sleep_us(100);
+    }
     // check if this is the very first start
     if (watchdog_caused_reboot() && boot_try == 0)
 	{
 		halt_with_error(1, 1);
 	}
     // is chip reset required
-    bool force_button = detect_by_pull_up(1, 0);
+    bool force_button = detect_by_pull(1, 0, 1);
     // start LED
     put_pixel(PIX_gre);
     // test pins
diff --git a/misc.c b/misc.c
index a9e4bc3..4ae8a85 100644
--- a/misc.c
+++ b/misc.c
@@ -52,7 +52,10 @@ void finish_pins_except_leds() {
 }
 
 void finish_pins_leds() {
-    gpio_disable_input_output(led_pin());
+    if (!is_tiny())
+    {
+        gpio_disable_input_output(led_pin());
+    }
     gpio_disable_input_output(pwr_pin());
 }
 
@@ -125,7 +128,10 @@ void put_pixel(uint32_t pixel_rgb)
     pio_sm_put_blocking(pio0, 3, pixel_grb << 8u);
     sleep_us(50);
     pio_sm_set_enabled(pio0, 3, false);
-    gpio_init(led_pin());
+    if (!is_tiny())
+    {
+        gpio_init(led_pin());
+    }
 }
 
 void gpio_disable_input_output(int pin)