A problem in increasing the BladeRF instantaneous bandwidth

Dear GNU Radio,

I am working on radar system development using BladeRF micro 2.0 and GNU Radio. Currently, my system performance is limited by the default sampling rate of the BladeRF which is ~80MSps. According to this page, there is a possibility to increase BladeRF bandwidth/sampling rate and I want to do it to enhance my radar performance. I was following this instruction by updating the firmware, then adding this argument into gr-osmocom sink and source block. 

"bladerf=0,sample_format=8,feature=oversample" 

However, I didn't see that it worked because when I increased my radar sampling rate, I got a warning that told me that the maximum accumulated sampling rate was still ~80MSps. 

Is there anyone know what did I miss? Thank you.

Best regards,

Edwar