How to run my custom MaskRCNN model on ROS in nano jetson

Hey guys,
I’m a newbie in jetson nano.
I have my custom model trained with maskrcnn(matterport/Mask_RCNN) and i got the model.h5, and i configured my model in ros and work fine in my personal laptop, (ros melodic), but in my nano i think it is not the same way… i have nano jetson and ros installed.
I saw i should convert .5h to .pb , i dont understand , if i should convert in my laptop or in nano ,
any experts can explain to me.
Thanks in advance.