Picked up three nails in my rear Mitas EO9 Dakar recently. Warmish day and the tyre was quite hot, but none the less still took 2 solid hours to change out the tube, mainly due to the inability to crack the bead from the rim.

Fortunately for me, my mate on a KTM 990 stopped to lend assistance, and we used his side stand, and the full weight of the Kato without success, until eventually he remembered he had a small bottle of lens cleaner (Water & Detergent mix) in his backpack. We squirted this around the edge of the rim and flexed the tyre to allow the liquid to run between the rim and the tyre, and hey presto...off she popped.

I only had a 21" tube available to get me home, and changed this out using a machine shown earlier in this thread without any problems.

I am seriously considering the viability of using EO9 Dakar's, on any trips when I will be riding alone. There is no way I could hope to break the bead without assistance.