diff --git a/internal_filesystem/lib/drivers/imu_sensor/bma423/bma423.py b/internal_filesystem/lib/drivers/imu_sensor/bma423/bma423.py
index 6dae8f08..60571625 100644
--- a/internal_filesystem/lib/drivers/imu_sensor/bma423/bma423.py
+++ b/internal_filesystem/lib/drivers/imu_sensor/bma423/bma423.py
@@ -39,22 +39,25 @@ class BMA423:
     # 2G, 4G, 8G and 16G. If we want to be able to measure higher
     # max accelerations, the relative precision decreases as we have
     # a fixed 12 bit reading.
-    def __init__(self,i2c,*,acc_range=2):
+    def __init__(self,i2c,*,acc_range=2,address=None):
         default_addr = [0x18,0x19] # Changes depending on SDO pin
                                    # pulled to ground or V+
         self.i2c = i2c
         self.myaddr = None
         self.features_in = bytearray(FEATURES_IN_SIZE)
 
-        found_devices = i2c.scan()
-        print("BMA423: scan i2c bus:", [hex(x) for x in found_devices])
-        for addr in default_addr:
-            if addr in found_devices:
-                self.myaddr = addr
-                break
-        if self.myaddr == None:
-            raise Exception("BMA423 not found at i2c bus")
-        print("BMA423: device with matching address found at",hex(self.myaddr))
+        if address is not None:
+            self.myaddr = address
+        else:
+            found_devices = i2c.scan()
+            print("BMA423: scan i2c bus:", [hex(x) for x in found_devices])
+            for addr in default_addr:
+                if addr in found_devices:
+                    self.myaddr = addr
+                    break
+            if self.myaddr == None:
+                raise Exception("BMA423 not found at i2c bus")
+            print("BMA423: device with matching address found at",hex(self.myaddr))
 
         # Device initialization.
         self.reset()
diff --git a/internal_filesystem/lib/mpos/board/lilygo_t_watch_s3_plus.py b/internal_filesystem/lib/mpos/board/lilygo_t_watch_s3_plus.py
index 7dfa6b94..1b7092fd 100644
--- a/internal_filesystem/lib/mpos/board/lilygo_t_watch_s3_plus.py
+++ b/internal_filesystem/lib/mpos/board/lilygo_t_watch_s3_plus.py
@@ -82,6 +82,12 @@ mic_input = AudioManager.add(
 # Vibrator test
 
 # One strong & fairly long buzz (repeat as needed)
+from machine import I2C, Pin
+i2c = I2C(1, sda=Pin(10), scl=Pin(11), freq=400000)
+
+def write_reg(reg, val):
+    i2c.writeto_mem(0x5A, reg, bytes([val]))
+
 write_reg(0x01, 0x00)                # internal trigger
 write_reg(0x03, 0)                   # Library A
 write_reg(0x04, 47)                  # Strong Buzz 100%
@@ -92,9 +98,8 @@ write_reg(0x0C, 0)                   # stop (optional)
 
 # IMU:
 import drivers.imu_sensor.bma423.bma423 as bma423
-from machine import SoftI2C, Pin
-i2c = SoftI2C(scl=11,sda=10)
-sensor = bma423.BMA423(i2c)
+sensor = bma423.BMA423(i2c, address=0x19)
+time.sleep_ms(500) # some sleep is needed before reading values
 print("temperature: ", sensor.get_temperature())
 print("steps: ", sensor.get_steps())
 print("(x,y,z): ", sensor.get_xyz())
diff --git a/internal_filesystem/lib/mpos/main.py b/internal_filesystem/lib/mpos/main.py
index ad37f1f6..000cca7e 100644
--- a/internal_filesystem/lib/mpos/main.py
+++ b/internal_filesystem/lib/mpos/main.py
@@ -107,7 +107,7 @@ def detect_board():
 
         print("lilygo_t_watch_s3_plus ?")
         if i2c0 := fail_save_i2c(sda=10, scl=11):
-            if single_address_i2c_scan(i2c0, 0x19): # IMU on 0x19, scan shows: [25, 52, 81, 90]
+            if single_address_i2c_scan(i2c0, 0x19): # IMU on 0x19, vibrator on 0x5A and scan also shows: [52, 81]
                 return "lilygo_t_watch_s3_plus" # example MAC address: D0:CF:13:33:36:306
 
         # Then do I2C-based board detection