Maybe there is a solder spot like on the sparkfun?
EDIT:
As you see here Teensy ino still look for ONLY 0x4A and 0x4B
// BNO08x address variables to check where it is
const uint8_t bno08xAddresses = { 0x4A, 0x4B };
const int16_t nrBNO08xAdresses = sizeof(bno08xAddresses) / sizeof(bno08xAddresses[0]);
uint8_t bno08xAddress;
BNO080 bno08x;