diff --git a/core/embed/trezorhal/stm32f4/backlight_pwm.c b/core/embed/trezorhal/stm32f4/backlight_pwm.c
index 9cddd1972b..becf4602fa 100644
--- a/core/embed/trezorhal/stm32f4/backlight_pwm.c
+++ b/core/embed/trezorhal/stm32f4/backlight_pwm.c
@@ -29,7 +29,7 @@ void backlight_pwm_init(void) {
 
   GPIO_InitTypeDef GPIO_InitStructure;
 
-  // LCD_PWM/PA7 (backlight control)
+  // LCD_PWM (backlight control)
   GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
   GPIO_InitStructure.Pull = GPIO_NOPULL;
   GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
@@ -37,34 +37,113 @@ void backlight_pwm_init(void) {
   GPIO_InitStructure.Pin = BACKLIGHT_PWM_PIN;
   HAL_GPIO_Init(BACKLIGHT_PWM_PORT, &GPIO_InitStructure);
 
-  // enable PWM timer
-  TIM_HandleTypeDef TIM_Handle;
-  TIM_Handle.Instance = BACKLIGHT_PWM_TIM;
-  TIM_Handle.Init.Period = LED_PWM_TIM_PERIOD - 1;
-  // TIM1/APB2 source frequency equals to SystemCoreClock in our configuration,
-  // we want 1 MHz
-  TIM_Handle.Init.Prescaler = LED_PWM_PRESCALER;
-  TIM_Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
-  TIM_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
-  TIM_Handle.Init.RepetitionCounter = 0;
-  HAL_TIM_PWM_Init(&TIM_Handle);
+  uint32_t tmpcr1 = 0;
+
+  /* Select the Counter Mode */
+  tmpcr1 |= TIM_COUNTERMODE_UP;
+
+  /* Set the clock division */
+  tmpcr1 |= (uint32_t)TIM_CLOCKDIVISION_DIV1;
+
+  /* Set the auto-reload preload */
+#ifdef STM32U5
+  tmpcr1 |= TIM_AUTORELOAD_PRELOAD_DISABLE;
+#endif
+
+  BACKLIGHT_PWM_TIM->CR1 = tmpcr1;
+
+  /* Set the Autoreload value */
+  BACKLIGHT_PWM_TIM->ARR = (uint32_t)LED_PWM_TIM_PERIOD - 1;
+
+  /* Set the Prescaler value */
+  BACKLIGHT_PWM_TIM->PSC = LED_PWM_PRESCALER;
+
+  /* Set the Repetition Counter value */
+  BACKLIGHT_PWM_TIM->RCR = 0;
+
+  /* Generate an update event to reload the Prescaler
+     and the repetition counter (only for advanced timer) value immediately */
+  BACKLIGHT_PWM_TIM->EGR = TIM_EGR_UG;
+
   pwm_period = LED_PWM_TIM_PERIOD;
 
-  TIM_OC_InitTypeDef TIM_OC_InitStructure;
-  TIM_OC_InitStructure.Pulse = 0;
-  TIM_OC_InitStructure.OCMode = BACKLIGHT_PWM_TIM_OCMODE;
-  TIM_OC_InitStructure.OCPolarity = TIM_OCPOLARITY_HIGH;
-  TIM_OC_InitStructure.OCFastMode = TIM_OCFAST_DISABLE;
-  TIM_OC_InitStructure.OCNPolarity = TIM_OCNPOLARITY_HIGH;
-  TIM_OC_InitStructure.OCIdleState = TIM_OCIDLESTATE_SET;
-  TIM_OC_InitStructure.OCNIdleState = TIM_OCNIDLESTATE_SET;
-  HAL_TIM_PWM_ConfigChannel(&TIM_Handle, &TIM_OC_InitStructure,
-                            BACKLIGHT_PWM_TIM_CHANNEL);
+  /* Set the Preload enable bit for channel1 */
+  BACKLIGHT_PWM_TIM->CCMR1 |= TIM_CCMR1_OC1PE;
+
+  /* Configure the Output Fast mode */
+  BACKLIGHT_PWM_TIM->CCMR1 &= ~TIM_CCMR1_OC1FE;
+  BACKLIGHT_PWM_TIM->CCMR1 |= TIM_OCFAST_DISABLE;
+
+  uint32_t tmpccmrx;
+  uint32_t tmpccer;
+  uint32_t tmpcr2;
+
+  /* Get the TIMx CCER register value */
+  tmpccer = BACKLIGHT_PWM_TIM->CCER;
+
+  /* Disable the Channel 1: Reset the CC1E Bit */
+  BACKLIGHT_PWM_TIM->CCER &= ~TIM_CCER_CC1E;
+  tmpccer |= TIM_CCER_CC1E;
+
+  /* Get the TIMx CR2 register value */
+  tmpcr2 = BACKLIGHT_PWM_TIM->CR2;
+
+  /* Get the TIMx CCMR1 register value */
+  tmpccmrx = BACKLIGHT_PWM_TIM->CCMR1;
+
+  /* Reset the Output Compare Mode Bits */
+  tmpccmrx &= ~TIM_CCMR1_OC1M;
+  tmpccmrx &= ~TIM_CCMR1_CC1S;
+  /* Select the Output Compare Mode */
+  tmpccmrx |= BACKLIGHT_PWM_TIM_OCMODE;
+
+  /* Reset the Output Polarity level */
+  tmpccer &= ~TIM_CCER_CC1P;
+  /* Set the Output Compare Polarity */
+  tmpccer |= TIM_OCPOLARITY_HIGH;
+
+  if (IS_TIM_CCXN_INSTANCE(BACKLIGHT_PWM_TIM, TIM_CHANNEL_1)) {
+    /* Check parameters */
+    assert_param(IS_TIM_OCN_POLARITY(OC_Config->OCNPolarity));
+
+    /* Reset the Output N Polarity level */
+    tmpccer &= ~TIM_CCER_CC1NP;
+    /* Set the Output N Polarity */
+    tmpccer |= TIM_OCNPOLARITY_HIGH;
+    /* Set the Output N State */
+    tmpccer |= TIM_CCER_CC1NE;
+  }
+
+  if (IS_TIM_BREAK_INSTANCE(BACKLIGHT_PWM_TIM)) {
+    /* Check parameters */
+    assert_param(IS_TIM_OCNIDLE_STATE(OC_Config->OCNIdleState));
+    assert_param(IS_TIM_OCIDLE_STATE(OC_Config->OCIdleState));
+
+    /* Reset the Output Compare and Output Compare N IDLE State */
+    tmpcr2 &= ~TIM_CR2_OIS1;
+    tmpcr2 &= ~TIM_CR2_OIS1N;
+    /* Set the Output Idle state */
+    tmpcr2 |= TIM_OCIDLESTATE_SET;
+    /* Set the Output N Idle state */
+    tmpcr2 |= TIM_OCNIDLESTATE_SET;
+  }
+
+  /* Write to TIMx CR2 */
+  BACKLIGHT_PWM_TIM->CR2 = tmpcr2;
+
+  /* Write to TIMx CCMR1 */
+  BACKLIGHT_PWM_TIM->CCMR1 = tmpccmrx;
+
+  /* Set the Capture Compare Register value */
+  BACKLIGHT_PWM_TIM->CCR1 = 0;
+
+  /* Write to TIMx CCER */
+  BACKLIGHT_PWM_TIM->CCER = tmpccer;
 
   backlight_pwm_set(0);
 
-  HAL_TIM_PWM_Start(&TIM_Handle, BACKLIGHT_PWM_TIM_CHANNEL);
-  HAL_TIMEx_PWMN_Start(&TIM_Handle, BACKLIGHT_PWM_TIM_CHANNEL);
+  BACKLIGHT_PWM_TIM->BDTR |= TIM_BDTR_MOE;
+  BACKLIGHT_PWM_TIM->CR1 |= TIM_CR1_CEN;
 }
 
 void backlight_pwm_reinit(void) {
diff --git a/core/site_scons/boards/stm32u5_common.py b/core/site_scons/boards/stm32u5_common.py
index 9ff5582dee..f8450a4155 100644
--- a/core/site_scons/boards/stm32u5_common.py
+++ b/core/site_scons/boards/stm32u5_common.py
@@ -18,7 +18,6 @@ def stm32u5_common_files(env, defines, sources, paths):
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_cortex.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_cryp.c",
-        "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_dma.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_dma2d.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_dsi.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_flash.c",
@@ -40,8 +39,6 @@ def stm32u5_common_files(env, defines, sources, paths):
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_rtc.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_spi.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_sram.c",
-        "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_tim.c",
-        "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_tim_ex.c",
         "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_ll_fmc.c",
     ]
 
diff --git a/core/site_scons/boards/trezor_t3t1_v4.py b/core/site_scons/boards/trezor_t3t1_v4.py
index 10c626f06c..90ee275ad7 100644
--- a/core/site_scons/boards/trezor_t3t1_v4.py
+++ b/core/site_scons/boards/trezor_t3t1_v4.py
@@ -56,6 +56,10 @@ def configure(
         sources += [
             "embed/trezorhal/stm32u5/haptic/drv2625/drv2625.c",
         ]
+        sources += [
+            "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_tim.c",
+            "vendor/stm32cube-u5/Drivers/STM32U5xx_HAL_Driver/Src/stm32u5xx_hal_tim_ex.c",
+        ]
         features_available.append("haptic")
 
     if "sd_card" in features_wanted: