SUOTA app non responsive while updating and stuck at 0%

I have checked with the debugger and it stucks here

GD25LQ80CEIG

Suota works when timer 0 has 1Khz time but fails at 20Khz

void _timer0_init(void)
{
timer0_config cfg = {
/*
* Select the clock source.
*
* This can be either the external crystal XTAL32K (low power clock)
*或crystal XTAL16MHz (fast clock).
*
* \note: In case the slow clock is selected (XTAL32K), and upon a HW reset (cold boot),
* it will take approximately 8 seconds for the crystal to settle (worst case).
* Thus, to avoid dissimilarities in PWM pulses, you should not enable any timer
* functionality for that period of time.
*/
.clk_src = HW_TIMER0_CLK_SRC_FAST,

/*
* Select the clock divider.
*
* In this example we divide the selected clock source, that is XTAL16MHz, with 8.
* Thus, the actual clock source of TIMER0 is 16/8 = 2MHz (0.5us each clock tick)
*/
.fast_clk_div = HW_TIMER0_FAST_CLK_DIV_8,

/* For PWM functionality the ON-counter clock divider should be disabled */
.on_clock_div = false,

/*
* T0 counter value is decremented on each clock cycle. At the beginning it's loaded from
* M-register然后,一旦达到零,加载from N-register (and then M and N again).
*
* PWM0 is high when counting down M-register and low when counting down N-register.
*
* In this example, we want to generate a 4kHz pulse (250us period). This means that TIMER0
* should measure 250us / 0.5us = 500 clock ticks.
*/

/*
* Duty cycle ON, expressed in clock ticks.
*
* In this example we want to generate a pulse with 50% duty cycle, so this
* value should be set to 500 / 2 = 250 clock ticks
*
*/
.t0_reload_m = 19,//1KHz 10% -> 199, 249, // Minus 1 clock tick since we start counting from 0

/*
* Duty cycle OFF, expressed in clock ticks.
*
* In our example, this value should be set to (500 - 250) = 250 clock ticks
*
*/
.t0_reload_n = 79,//1KHz 10% -> 1789,249, // Minus 1 clock tick since we start counting from 0

/*
* This value declares the time (expressed in clock ticks) an interrupt will be issued.
* In a typical application this value equals to the sum of M-register and N-register.
*
* \note: An interrupt will be issued when ON-counter reaches zero and T0-counter reaches
* zero while decrementing the value loaded in N-register. (when a full PWM cycle
* is complete). For instance, and given the current configurations, a value set to
* [500] will result in issuing an interrupt every 2 PWM cycles (500us)
*/
.on_reload = 98 //1KHz -> 1998,//498, // 249 + 249 = 498

/* PWM table 21Khz
* Total 92 for 21Khz and 1998 for 1Khz
* HighValue = 92 x (PWM_Percentage/100)
* LowValue = 92 - High Value
* PWM % High Low
5 5 87
10 9 83
15 14 78
20 18 74
25 23 69
30 28 64
35 32 60
40 37 55
45 41 51
50 46 46
55 51 41
60 55 37
65 60 32
70 64 28
75 69 23
18 80 74
85 78 14
90 83 9
95 87 5
100 92 0
*/

};

// Initialize TIMER_0
hw_timer0_init(&cfg);

In a non suota project i can do suota update and that doesnt make much sense cz in a suota project , issue occurs while souta updating